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Mostly Sunny Wednesday
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Last Complete Site Update: 8/11 - 3:57 PM
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"This morning, the sun endures past dawn.
I realize that it is August: the summer’s last stand."
- Sara Baume
Today’s Weather at a Glance
Updated Every Morning and as Needed Through the Day
(Averages Across Southern NH)
83Degrees
High Temperature
0%
Probability of Precipitation - Daytime
61Degrees
Low Temperature
0%
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 17
Nashua - East
Peterborough - Central/West
Tuesday/Tuesday Night - August 11
Nashua - East
Partly cloudy, with a low around 60. Northwest wind around 5 mph becoming calm in the evening.
Peterborough - Central/West
Partly cloudy, with a low around 56. Northwest wind around 5 mph becoming calm in the evening.
Wednesday/Wednesday Night - August 12
Nashua - East
Mostly sunny, with a high near 84. Northwest wind around 5 mph.
Partly cloudy, with a low around 61. Calm wind.
Peterborough - Central/West
Areas of fog before 7am. Otherwise, mostly sunny, with a high near 79. Calm wind becoming northwest around 5 mph in the afternoon.
Partly cloudy, with a low around 59. Calm wind.
Thursday/Thursday Night - August 13
Nashua - East
Mostly sunny, with a high near 84. Calm wind becoming west around 5 mph in the afternoon.
A 30 percent chance of showers after 5am. Partly cloudy, with a low around 59. West wind around 5 mph becoming calm.
Peterborough - Central/West
Mostly sunny, with a high near 79. Calm wind becoming west around 5 mph in the afternoon.
A 30 percent chance of showers after 5am. Partly cloudy, with a low around 55. Calm wind.
Friday/Friday Night - August 14
Nashua - East
Sunny, with a high near 81.
Clear, with a low around 54.
Peterborough - Central/West
Sunny, with a high near 76.
Clear, with a low around 50.
Saturday/Saturday Night - August 15
Nashua - East
Peterborough - Central/West
Sunday/Sunday Night - August 16
Nashua - East
Peterborough - Central/West
Current Weather Readings in Peterborough, NH
Time of the readings below: 12 Aug 2026 12:47 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:
78.7°F (1.9)
High Temperature:
78.7 at 12:44 PM
Low Temperature:
58.1 at 6:43 AM
Precipitation Today:
0.00 inches
Current Dewpoint:
59.0°F (-1.4)
Highest Heat Index Reading:
78.7 at 12:44 PM
Current Windspeed:
1 MPH (-0)
Barometric Trend:
Steady
Hours of Daylight Today:
14:01
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: 8/11 - 3:57 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:
No site update tomorrow (8/12) morning. Back to the regular schedule Later tomorrow afternoon.
Quiet weather tonight and through Wednesday. Still warm and humid MA line south to the CT coast. Cold front arrives midday Thursday with a chance for showers and thunderstorms. Smoke from the fires in Spokane WA are now reaching the east coast for at least the next couple of days. A very pleasant weekend seems to be in the cards. We will see!
Partial Solar Eclipse on Wednesday. See the graphics in the News Section for viewing details.
Mainly fair weather is expected tonight through Wednesday night, with widely scattered showers and isolated thunderstorms possible Wednesday afternoon. A few storms could produce gusty winds, but most locations should remain dry. Showers and thunderstorms become more likely Thursday and Friday, followed by mostly dry and pleasant weather this weekend. Astronomical tides will be near their monthly high Thursday, but significant coastal impacts should remain limited.
Start looking up next week:
4 major celestial events to dominate the night sky this week
Check out the enhanced "Todays Weather at a Glance" section above.
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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 1942, actress Hedy Lamarr, along with George Antheil, received U.S. Patent No. 2,292,387 for a "Secret Communication System." Their frequency-hopping concept aimed to prevent enemy jamming of radio-controlled torpedoes during WWII, paving the way for Wi-Fi, Bluetooth, and GPS.
Latest site updates and additions:
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
05/02 - Find the Summer 2026 Outlook for the USA here.
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: 07/30 - Next Update: 08/16 (or thereabouts)
Weather Summaries and Full Area Forecast Discussions - North (Edited)
Summary - Northern New England - New Hampshire and Maine
Summary:
Mainly fair weather is expected tonight through Wednesday night, with widely scattered showers and isolated thunderstorms possible Wednesday afternoon. A few storms could produce gusty winds, but most locations should remain dry. Showers and thunderstorms become more likely Thursday and Friday, followed by mostly dry and pleasant weather this weekend. Astronomical tides will be near their monthly high Thursday, but significant coastal impacts should remain limited.
Key Messages:
- Mainly fair weather is expected tonight through Wednesday night, with widely scattered showers and isolated thunderstorms possible Wednesday afternoon. There is a low potential for gusty winds.
- Showers and thunderstorms are likely toward the end of the week, with mostly dry weather expected over the weekend. Astronomical tides will be at a monthly high, but impacts should remain minimal.
What has changed since the last Forecast Update?
Little change to the going forecast at this time.
What this means for you:
Tonight should be mostly quiet aside from some locally dense valley fog. Wednesday will be mainly dry, although a few afternoon showers and thunderstorms could develop, with an isolated chance for gusty winds. Thursday and Friday bring a better chance for showers and storms. The weekend looks dry and pleasant, with temperatures near 80 degrees. Coastal areas could see some higher-than-normal water levels Thursday, but significant flooding is not expected.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
**Area Forecast Discussion, National Weather Service Gray ME, 238 PM EDT Tue Aug 11 2026**
**What Has Changed**
Little change to the going forecast at this time.
**Key Messages**
1. Mainly fair weather is expected tonight through Wednesday night, with widely scattered showers and isolated thunderstorms possible Wednesday afternoon. There is a low potential for gusty winds.
2. Showers and thunderstorms are likely toward the end of the week, with mostly dry weather expected over the weekend. Astronomical tides will be at a monthly high, but impacts should remain minimal.
**Discussion**
**Key Message 1**
Other than locally dense valley fog tonight, the weather will be fair. Radiational cooling, which happens when the ground loses heat overnight under mostly clear skies, will bring temperatures down into the 50s in outlying areas, with a few spots in northern New Hampshire possibly reaching the upper 40s. The forecast has been heavily based on the MET and MAV computer forecast guidance.
A weak short wave trough, an area of lower pressure and rising air in the upper atmosphere, will approach northern New England Wednesday. This feature, combined with at least weak instability, should allow for widely scattered showers and isolated thunderstorms during the afternoon.
Surface dewpoint depression is the difference between the temperature and the dewpoint near the ground. Values around 20 degrees indicate relatively dry air near the surface, which could allow gusty winds to reach the ground within some showers and thunderstorms. However, showers and storms should remain widely scattered, and most locations will likely stay dry.
Valley fog will likely develop again late Wednesday night.
**Key Message 2**
A weak trough axis, or elongated area of lower pressure, will move into the area Thursday afternoon and is likely to persist through Friday. During its passage, showers and thunderstorms are possible.
Precipitable water, abbreviated PWAT, describes the total amount of moisture available in the atmosphere. Values of 1.1 to 1.5 inches should provide enough moisture for showers and storms, but the overall setup should keep them fairly scattered rather than widespread.
We will also need to keep an eye on the high tides Thursday. Astronomical tides, which are the regular tides caused primarily by the gravitational pull of the Moon and Sun, will be high for the month. Tide gauges could approach minor flood stage.
However, light offshore winds and very low wave heights should limit the overall coastal impacts. Some higher water levels are possible along the coast, but otherwise impacts should remain minimal.
**Weekend Outlook**
Over the weekend, a mid-level ridge, an area of higher pressure in the middle levels of the atmosphere, will move into the area. Ridging and surface high pressure should bring dry and pleasant weather, with high temperatures near 80 degrees.
Weather Summaries and Full Area Forecast Discussions - South (Edited)
Summary - Southern New England - Massachusetts/Northern CT/Rhode Island
Summary:
Wednesday will be seasonable and fairly comfortable, with highs in the low to mid 80s and most areas remaining dry. A few showers are possible along the south coast, Cape Cod, and the Islands, mainly Wednesday morning into early afternoon. Rain chances increase Thursday into Friday as a front lingers near the south coast. Drier and cooler weather is expected this weekend, with another possible increase in rain chances early next week.
Key Messages:
- Seasonable temperatures and comfortable humidity Wednesday. There is a low chance for a few showers along the south coast, Cape Cod, and the Islands Wednesday. Otherwise, conditions should remain dry.
- Rain chances increase later Thursday into Friday as a front lingers near the south coast of New England. High pressure then brings drier and cooler weather this weekend. Rain chances may increase again early next week as a low pressure system passes through.
What has changed since the last Forecast Update?
There is increased uncertainty regarding shower potential Wednesday.
What this means for you
Wednesday looks like a mostly dry and comfortable day for most of southern New England. The best chance for showers will be along the south coast, Cape Cod, and the Islands. Thursday and Friday become more unsettled, although much of the time should remain dry. The weekend currently looks cooler and drier, while the forecast becomes less certain early next week.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
**Area Forecast Discussion, National Weather Service Boston/Norton MA, 220 PM EDT Tuesday, August 11, 2026**
**What has Changed**
There is increased uncertainty regarding shower potential Wednesday.
**Key Messages**
Seasonable temperatures and comfortable humidity Wednesday. There is a low chance for a few showers along the south coast, Cape Cod, and the Islands Wednesday. Otherwise, conditions should remain dry.
Rain chances increase later Thursday into Friday as a front lingers near the south coast of New England. High pressure then brings drier and cooler weather this weekend. Rain chances may increase again early next week as a low pressure system passes through.
**Discussion**
**Key Message 1, Wednesday**
Seasonable temperatures and comfortable humidity Wednesday. There is a low chance for a few showers along the south coast, Cape Cod, and the Islands Wednesday. Otherwise, conditions should remain dry.
Most areas are likely to remain dry for the remainder of this afternoon and evening. The one exception is the chance for a stray shower or thunderstorm to reach northwest Connecticut late this afternoon or early this evening. Overnight temperatures will fall into the 60s with periods of cloud cover.
There is still lower confidence in the potential for an offshore low pressure system to brush across southern New England on Wednesday. This uncertainty is reflected in both the standard forecast models and ensemble guidance, which uses multiple forecast scenarios to show the range of possible outcomes.
Some forecast solutions develop a low pressure system that tracks north and brings showers to the south coast, Cape Cod, and the Islands. Other solutions do not develop a stronger surface low, or keep the system far enough south to limit shower chances across southern New England.
GEFS probabilities for more than 0.01 inches of precipitation range from 30 to 60 percent, with probabilities dropping off quickly north of the immediate coast. ECMWF probabilities are greater than 20 percent. The NAM and RRFS have trended farther north, bringing a more organized area of showers across at least southern and southeastern southern New England.
Given the range of possibilities, the main concern is for some light showers Wednesday morning into early afternoon, with the greatest risk along the south coast, Cape Cod, and the Islands. If the system remains mainly south of the region, Wednesday should be a drier day.
With winds higher in the atmosphere becoming more west to east, temperatures will cool slightly, bringing more seasonable highs Wednesday in the low to mid 80s.
There will likely be a shift toward a more unsettled weather pattern late Wednesday into Thursday, with signs of a frontal boundary stalling across part of southern New England. A few weak disturbances may move along this boundary, resulting in periods of showers beginning as early as Wednesday night.
**Key Message 2, Thursday into Early Next Week**
Rain chances increase later Thursday into Friday as a front lingers near the south coast of New England. High pressure then brings drier and cooler weather this weekend. Rain chances may increase again early next week as a low pressure system passes through.
There are still some timing differences to be worked out Thursday into Friday. Most of the latest global forecast guidance places a cold front near the south coast of New England Thursday morning.
The main differences involve how quickly this front moves far enough south of the region to no longer affect our weather. The current consensus keeps the front close to the south coast into Friday morning, although the front could move south more quickly, resulting in a drier Friday.
There will not be a lot of humidity to work with, but there is at least a risk for afternoon showers and thunderstorms. A good portion of this period should remain dry for most locations.
The front should finally move offshore later Friday, allowing high pressure to build across southern New England. This should bring drier and cooler conditions for the weekend.
The forecast for early next week remains uncertain. Although there are some differences in timing, the overall consensus is for a low pressure system to move across northern New England sometime Monday. This system should move offshore to the east by Tuesday. The exact timing could change with later forecasts.
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: 77 Degrees - Low Temperature: 55 Degrees
(Tip: Place your cursor over the bar below to see the number)
Weather News/Headlines of Interest
Severe thunderstorms, flash flooding to threaten Plains, Midwest and East
Invest 92L designated in the Atlantic as tropical activity ramps up in the main development region
Monster 20-foot waves eye Hawaii as Invest 93C churns in the Pacific, threatens late-week impacts
Buildings collapse following powerful earthquake in Colombia Monday morning
Louisiana officials urge caution after 5 confirmed deaths from flesh-eating bacteria
Perseid meteor shower peaks Wednesday night under ideal conditions
NH man captures whale sighting on video off New England coast
Amber Met Office extreme heat warning issued as temperatures could reach 38C
Solar eclipse 2026 guide: Everything you need to know about Wednesday's must-see sky show
Fall forecast 2026: Summer warmth may linger US as El Nino intensifies
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