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Patchy Fog - Cloudy - Chance of showers tonight
Patchy Fog - Chance of Showers & Thunderstorms Sunday
Last Complete Site Update: 8/22 - 4:03 PM
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"August was nearly over - the month of apples and falling stars, the last care-free month for the school children. The days were not hot, but sunny and limpidly clear -
the first sign of advancing autumn."
- Viktor Nekrasov
Today’s Weather at a Glance
Updated Every Morning and as Needed Through the Day
(Averages Across Southern NH)
72Degrees
High Temperature
30%
Probability of Precipitation - Daytime
57Degrees
Low Temperature
30%
Probability of Precipitation - Nighttime
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Today in Peterborough, NH at a Glance
Today in Nashua, NH at a Glance
Your Daily Forecast - Three Days at a Time
No Active Advisories
None
Monday/Monday Night - August 24
Nashua - East
Sunny, with a high near 81. Light southwest wind increasing to 5 to 10 mph in the morning.
Mostly clear, with a low around 54. West wind around 5 mph becoming calm.
Peterborough - Central/West
Sunny, with a high near 76. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Mostly clear, with a low around 52. Calm wind.
Tuesday/Tuesday Night - August 25
Nashua - East
Sunny, with a high near 80.
Mostly clear, with a low around 56.
Peterborough - Central/West
Sunny, with a high near 75.
Mostly clear, with a low around 54.
Wednesday/Wednesday Night - August 26
Nashua - East
Peterborough - Central/West
Thursday/Thursday Night - August 27
Nashua - East
Peterborough - Central/West
Friday/Friday Night - August 28
Nashua - East
Peterborough - Central/West
Saturday/Saturday Night - August 22
Nashua - East
A 20 percent chance of showers. Patchy fog after 7pm. Otherwise, cloudy, with a low around 58. East wind around 5 mph becoming calm in the evening.
Peterborough - Central/West
A 30 percent chance of showers, mainly after 3am. Patchy fog after 8pm. Otherwise, mostly cloudy, with a low around 56. East wind around 5 mph becoming calm in the evening. New precipitation amounts of less than a tenth of an inch possible.
Sunday/Sunday Night - August 23
Nashua - East
A chance of showers, with thunderstorms also possible after 11am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 78. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
A 30 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 59. Calm wind. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Peterborough - Central/West
A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 4pm, then showers likely and possibly a thunderstorm after 4pm. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 73. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers and thunderstorms likely, mainly before 10pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 57. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Current Weather Readings in Peterborough, NH
Time of the readings below: 22 Aug 2026 5:26 PM
(FYI: The number in parentheses is the change in the last hour)
(Note: My weather Instruments are Offline from Midnight Wednesday to 7AM Thursday for system Back ups.)
Current Temperature:
66.5°F (-0.4)
High Temperature:
69.6 at 1:02 PM
Low Temperature:
59.5 at 3:50 AM
Precipitation Today:
0.00 inches
Current Dewpoint:
62.2°F (0.3)
Highest Heat Index Reading:
69.6 at 1:02 PM
Current Windspeed:
0 MPH (0)
Barometric Trend:
Falling Slowly
Hours of Daylight Today:
13:35
Link to my Active Weather Instruments
Information for New England
Seven Day Temperature Outlook - Manchester NH & Southern New England
Current Northeast Radar
Expected Temperature Range
Health - The Five Day Allergy & Mosquito Outlook for Southern NH
Rich's Weather Discussion
New Hampshire/North Briefing
Massachusetts/South Briefing
At this moment: 8/22 - 3:54 PM
Notes from Rich:
What is the 'Regular’ Schedule.
Weekdays: Morning updates each day before 8AM, Evening Updates before 7PM.
On Weekends: Perhaps a bit later. I like to sleep in.
Every Thursday morning I post the daily forecast through the weekend.
Upcoming Site Update Schedule Changes:
The regular schedule continues. The Sunday morning update (8/23) may be a bit later than usual..
No rain here in Peterborough, NH today. In fact, at one point, the sun popped out. Overcast skies are the rule over much of New England with patchy fog developing tonight. Low pressure over Quebec will send several fronts across the region tonight and Sunday. We expect showers to develop with some thunderstorms as well. However, this doesn’t look widespread at the moment, so there is a chance some won't see any rainfall. The best chance appears to be in NW NH, SW NH and probably in central NH.
Check back for the Sunday morning update. Which might be a bit later than ususl.
Unsettled weather will continue through Sunday night, with mostly cloudy skies, scattered showers, and a chance for a few strong thunderstorms Sunday afternoon and evening. Widespread heavy rainfall is not expected. Showers may linger Monday and Tuesday as an upper level low remains nearby, followed by drier and warmer weather around midweek. Humidity may increase again late next week ahead of another weather system.
Hawaii needs to watch the forecast closely this weekend. While crews on the Big Island are still clearing washed-out roads and downed lines from Hurricane Lala, which dropped more than 3 feet of rain in spots last weekend, damaged about 100 homes and six bridges, cut power to more than 100,000 customers and left one woman dead, a developing system that will soon be named Tropical Storm Moke is building.
This system's closest pass to the Big Island is expected Sunday into Monday, which means right now is the time to prepare. With this storm, wind speeds won't be the headlines; rain will. Five to 15 inches are possible on the Big Island, especially over the mountains and eastern slopes, with 1 to 5 inches elsewhere in the chain. This could mean more life-threatening flash flooding and landslides.
Get prepared now, charge all your devices, and stay safe.
The Drought Info has been updated.
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What information can you find on my site, and where is it?
The History Section has a lot of history to share, and I will be sharing video on this page from time to time. Updated every day with new weather history.
Find beach and hiking, and Ski information as well as travel info for the USA in the Travel and Leisure Section.
Find all Tropical Tracking/Hurricane information on the Tropics Page.
Find the current Drought Maps here. Now showing a map for each New England State.
Looking for Radar? Try the Radar Page.
Looking for Weather News from Across the globe, plus more local weather info? Look here.
Note: When you move your cursor over an image, the image fades. Click on the image and that opens a lightbox view that expands the image and allows you to click through all of the images in a section.
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On this day in history:
On this day in 1851, the U.S. schooner America beat Britain in a race around the Isle of Wight, claiming a silver trophy later gifted to the New York Yacht Club for perpetual international competition. That prize, the "America's Cup," is now the world's oldest continuously contested internatioinal sporting trophy.
Latest site updates and additions:
08/17 - See the First look at Autumn Maps and info here
Find the August Almanac Here
Hurricane Season began on June 1st - Details and forecasts can be found here.
07/17 - Find the Mosquito Outlook in the Heath Section. Added Mosquito forecast for Nashua
05/01 - The Hampton Beach Report returns! Updated daily.
In the Health Section above, starting April 7, you will find the Allergy Forecasts for Southern NH.
You can find my weather Reading via Weather Underground here: Peterborough, NH Readings
Catch Weather News Headlines and links here.
I have updated Rain/Snowfall totals here.
Drought information updates every Other Thursday evening. Last update: 08/15 - Next Update: 08/31 (or thereabouts)
Weather Summaries and Full Area Forecast Discussions - North (Edited)
Summary - Northern New England - New Hampshire and Maine
Summary:
Unsettled weather will continue through Sunday night, with mostly cloudy skies, scattered showers, and a chance for a few strong thunderstorms Sunday afternoon and evening. Widespread heavy rainfall is not expected. Showers may linger Monday and Tuesday as an upper level low remains nearby, followed by drier and warmer weather around midweek. Humidity may increase again late next week ahead of another weather system.
Key Messages:
- Unsettled weather is expected through Sunday night, but no widespread significant rainfall amounts are anticipated.
- Isolated rain chances Monday and Tuesday under a lingering upper level low. Tranquil conditions by midweek, with increasing humidity possible late in the week ahead of another system.
What has changed since the last Forecast Update?
No significant changes to the forecast were needed.
What this means for you:
Expect a mostly cloudy and occasionally damp weekend. Sunday afternoon and evening have the greatest potential for thunderstorms, with a few storms possibly producing strong or locally damaging wind gusts. Monday and Tuesday will remain somewhat unsettled with hit or miss showers and a few possible thunderstorms. Conditions should become quieter and warmer by midweek.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
**Area Forecast Discussion, National Weather Service Gray ME, 222 PM EDT
Sat Aug 22 2026**
**What has changed**
No significant changes since the previous forecast cycle.
**Key Messages**
1. Unsettled weather is expected through Sunday night, but no widespread significant rainfall amounts are anticipated.
2. Isolated rain chances Monday and Tuesday under a lingering upper level low. Tranquil conditions by midweek, with increasing humidity possible late in the week ahead of another system.
**Discussion**
**Sunday and Sunday night**
Mainly cloudy skies will persist through the remainder of today, with an increasing chance for a few scattered showers, especially across western Maine. Temperatures will remain nearly steady in the lower to middle 70s in most locations.
Marine fog and low clouds, also known as stratus, are expected to move inland overnight, especially across western Maine south of the foothills and along the New Hampshire Seacoast. Otherwise, it will remain cloudy with a few scattered showers possible at times. Overnight lows will be in the 50s to near 60 degrees in most locations.
A closed low pressure system will move across southern Quebec on Sunday, sending several fronts across New England. Our region will be in a weak warm sector, with some partial clearing allowing temperatures to reach the middle to upper 70s. Dew points will rise into the upper 60s to near 70 degrees, making it feel more humid.
A negatively tilted H5 trough, meaning an upper level trough angled from southwest to northeast, will arrive during the afternoon into early evening. This will help strengthen winds higher in the atmosphere and encourage rising air.
Forecast models indicate increasing atmospheric instability, with MU/MLCAPE, a measure of available energy for thunderstorms, reaching roughly 500 to 1000 J/kg. Wind shear through the lowest 6 kilometers of the atmosphere is expected to be around 35 to 40 knots. Cooler temperatures higher in the atmosphere will also help support thunderstorm development.
As a result, a few strong to marginally severe thunderstorms are possible. The primary threat will be strong to locally damaging wind gusts, although hail cannot be ruled out in the strongest storms. The greatest threat appears to be between 2 PM and 8 PM, with eastern portions of the forecast area having less potential because of southeast surface winds.
Sunday night will continue to feature a chance for a few widely scattered showers and areas of fog. Overnight lows will fall to within a few degrees either side of 60 degrees in most locations.
**Monday and Tuesday**
A closed upper level low will continue to move slowly from southwest to northeast across Quebec from Monday through Tuesday night. This will keep plenty of clouds over the region as New England remains under persistent cyclonic flow aloft, meaning winds higher in the atmosphere will continue circulating around the upper low.
Widespread significant rainfall is not expected, but isolated to scattered hit or miss showers will be possible at times. A locally heavy downpour cannot be ruled out. Breaks in the clouds may also allow enough instability to develop Monday and Tuesday afternoons for a few thunderstorms.
Wind shear should be sufficient for a few stronger storms if thunderstorms become well developed. Gusty winds would be the primary threat.
**Midweek and Late Week**
The upper level low should move away Wednesday into Thursday as upper level ridging, an area of higher pressure and generally sinking air aloft, approaches from the west. This should bring drier weather and warming temperatures.
The ridge will move overhead fairly quickly, with the next weather system approaching late in the work week and possibly continuing into the weekend. Humidity is expected to increase ahead of that system.
Weather Summaries and Full Area Forecast Discussions - South (Edited)
Summary - Southern New England - Massachusetts/Northern CT/Rhode Island
Summary:
A mostly cloudy and humid night is ahead with spotty light showers or drizzle, but much of the time will remain dry. Sunday will be more humid, with a few showers and thunderstorms possible, especially near and west of the Connecticut River Valley. There is a low risk for one or two strong to severe thunderstorms in that area, mainly capable of producing very localized damaging wind gusts and brief torrential rainfall. Drier and more seasonable weather returns Monday and continues through much of next week, with rain chances returning Thursday and Friday.
Key Messages:
- Spotty light showers or drizzle tonight, but much of the time will be dry. More humid Sunday with a few showers and thunderstorms possible, especially near and west of the Connecticut River Valley, where an isolated strong to severe thunderstorm or two is possible.
- Drier with a return to seasonable temperatures next week. Rain chances return Thursday and Friday.
What has changed since the last Forecast Update?
No significant changes to the forecast.
What this means for you
Tonight will be mainly cloudy with occasional light showers or drizzle, but most locations should stay dry much of the time. Some heavier showers or thunderstorms could develop near Cape Cod and the Islands toward daybreak Sunday. Sunday afternoon and early evening bring the best chance for showers and thunderstorms, especially west of the Connecticut River Valley. Most of the day should still be dry. Temperatures will be in the 70s to near 80 degrees, with noticeably higher humidity.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
**Area Forecast Discussion, National Weather Service Boston/Norton MA
315 PM EDT Sat Aug 22 2026**
**WHAT HAS CHANGED**
No significant changes to the forecast.
**KEY MESSAGES**
* Spotty light showers or drizzle tonight, but much of the time will be dry. More humid Sunday with a few showers and thunderstorms possible, especially near and west of the Connecticut River Valley, where an isolated strong to severe thunderstorm or two is possible.
* Drier with a return to seasonable temperatures next week. Rain chances return Thursday and Friday.
**DISCUSSION**
**KEY MESSAGE 1, Spotty light showers or drizzle tonight, followed by a more humid Sunday**
Weak offshore low pressure will continue to bring moist northeast low level flow into tonight. This will result in rather cloudy skies with occasional spotty light showers or drizzle. The precipitation will be quite light, and much of the night should remain dry.
Some shortwave energy, an area of enhanced atmospheric motion several thousand feet above the ground, may allow a few heavier showers and perhaps a couple of thunderstorms to develop near the southeastern New England coast toward daybreak Sunday, mainly near Cape Cod and the Islands. Earlier model guidance placed this activity farther west, but the latest guidance favors Cape Cod and the Islands, closer to the area of enhanced upper level energy.
Overnight low temperatures will only fall into the lower to middle 60s because of the clouds and abundant low level moisture. Areas of fog will also be possible, especially near the coast and in the Worcester Hills.
A few showers and isolated thunderstorms will need to be watched near Cape Cod and the Islands early Sunday morning. Otherwise, the main concern for showers and thunderstorms will be Sunday afternoon and early evening as daytime heating creates instability and additional upper level energy moves in from the west.
Most of the stronger atmospheric forcing, or the processes that encourage rising air and storm development, will remain to our west. Therefore, the greatest risk for showers and thunderstorms will be near and west of the Connecticut River Valley Sunday afternoon and early evening.
Instability will be limited by considerable cloud cover. However, effective wind shear of more than 40 knots, meaning winds that change speed and direction with height and can help thunderstorms become stronger, will support a low risk for an isolated strong to severe thunderstorm or two.
The main severe weather threats would be very localized damaging wind gusts and brief torrential rainfall, with the greatest risk near and west of the Connecticut River Valley.
That said, much of Sunday should remain dry, although humidity will be higher than Saturday. High temperatures will be in the 70s to near 80 degrees.
**KEY MESSAGE 2, Drier and more seasonable weather next week**
A post-frontal air mass, meaning cooler and drier air moving in behind a weather system, will bring drier conditions and warmer temperatures Monday along with westerly winds.
As skies gradually clear following the dreary weekend, dewpoints will begin to fall slightly into the upper 50s, compared with the lower to middle 60s recently. Lower dewpoints mean less moisture in the air and more comfortable conditions.
High pressure will slowly build Tuesday into Wednesday, helping maintain clear skies, drier weather, and warmer temperatures through the middle of the week.
Rain chances return Thursday and Friday as a low pressure system develops over the Great Lakes and moves eastward through southern Ontario. There remains some uncertainty regarding when the showers will begin because the global ensemble forecast systems, which use many model simulations to assess possible outcomes, show limited agreement on the exact position of the low pressure system as it moves through Canada.
Countdown to Autumn
Autumn Begins on: September 23, 2026 at 2:05 AM EDT
92Days18Hours28Mins13Secs
Five Day Daily Temperature Run - Peterborough, NH
Updated Every Morning
Normal Daily Averages
High Temperature: 75 Degrees - Low Temperature: 54 Degrees
(Tip: Place your cursor over the bar below to see the number)
Weather News/Headlines of Interest
Tropical Storm Moke to sideswipe Hawaii with heavy rain, renewed flood risk
10 days in the dark: Indiana derecho leaves thousands waiting for power
Back-to-back tropical threat for Hawaii, impacts to start this weekend
Tornado tears through Dover, Delaware, leaving significant damage, prompting state of emergency
Lightning strike kills man in Virginia as violent severe weather slams the East Coast
Magnitude 5.8 earthquake rattles Japan, shaking felt in Tokyo
Scientists uncover potentially significant movement at one of America's most dangerous fault lines
Sucky situation! Wild moment octopus latches onto fisherman’s face forcing him to club it to escape
New Hampshire can bill hikers for mountain rescues. A $25 card can help avoid the cost
Fall forecast 2026: Summer warmth may linger US as El Nino intensifies
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