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Patchy Fog Tonight
Chance of a Showers Tuesday Afternoon
Last Complete Site Update: 8/17 - 5:32 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)
74Degrees
High Temperature
50%
Probability of Precipitation - Daytime
64Degrees
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
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Monday/Monday Night - August 17
Nashua - East
Patchy fog after 9pm. Otherwise, cloudy during the early evening, then becoming partly cloudy, with a low around 63. Calm wind.
Peterborough - Central/West
Patchy fog after 8pm. Otherwise, mostly cloudy, with a low around 63. Calm wind.
Tuesday/Tuesday Night - August 18
Nashua - East
A 30 percent chance of showers, mainly after 4pm. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 83. Calm wind.
A 30 percent chance of showers, mainly before 7pm. Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 61. Calm wind.
Peterborough - Central/West
A 30 percent chance of showers and thunderstorms, mainly between 3pm and 4pm. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 79. Calm wind.
Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 59. Calm wind.
Wednesday/Wednesday Night - August 19
Nashua - East
Mostly cloudy, then gradually becoming sunny, with a high near 85. Calm wind becoming west around 5 mph in the afternoon.
Mostly clear, with a low around 63. West wind around 5 mph becoming calm.
Peterborough - Central/West
Mostly cloudy, then gradually becoming sunny, with a high near 81. Calm wind becoming west around 5 mph in the afternoon.
Partly cloudy, with a low around 61. Calm wind.
Thursday/Thursday Night - August 20
Nashua - East
A 30 percent chance of showers after 4pm. Mostly sunny, with a high near 84.
A 30 percent chance of showers before 7pm. Partly cloudy, with a low around 57.
Peterborough - Central/West
A 30 percent chance of showers after 4pm. Mostly sunny, with a high near 79.
A 30 percent chance of showers before 7pm. Partly cloudy, with a low around 55.
Friday/Friday Night - August 21
Nashua - East
Peterborough - Central/West
Saturday/Saturday Night - August 22
Nashua - East
Peterborough - Central/West
Sunday/Sunday Night - August 23
Nashua - East
Peterborough - Central/West
Current Weather Readings in Peterborough, NH
Time of the readings below: 18 Aug 2026 6:21 AM
(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:
63.6°F (-0.8)
High Temperature:
67.4 at 2:34 AM
Low Temperature:
63.2 at 6:04 AM
Precipitation Today:
0.00 inches
Current Dewpoint:
62.4°F (-0.5)
Highest Heat Index Reading:
67.4 at 2:34 AM
Current Windspeed:
0 MPH (0)
Barometric Trend:
Steady
Hours of Daylight Today:
13:46
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: 8/17 - 7:04 AM
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:
On Schedule.
The daily forecast remains elusive this week. Some fog around the region tonight. Tuesday still has a small chance of hit & miss showers. Looks like more sunshine south down in MA. Wednesday starts off mostly cloudy, but should end up sunny and dry. Another chance for hit and miss showers Thursday. Right now Friday looks dry.
A weak front will bring a chance for a few scattered thunderstorms this afternoon, mainly across interior areas of northern New England. Fog will become widespread tonight behind the front, with another chance for a few showers or storms Tuesday. The rest of the week looks relatively quiet, with only a couple chances for light rain
Another Eclispe to catch: Look, I know most of us weren't able to watch last week's total solar eclipse in person. And yes, seeing photos of it, or watching it on livestream - those are great, but they aren't the real thing. So I just want to tell you that eclipse regret is real, and it's OK to feel it. But I also want to let you know that this month actually has a second eclipse in store. Here's the deal: A deep partial lunar eclipse will occur next week on Aug. 27?Äì28, covering roughly 96% of the moon in shadow. And while it won't be getting as many headlines as last week's big solar eclipse (what can I say? Our entire solar system has a solar bias), the good news is that pretty much everyone across the country will be able to see it, so long as the clouds cooperate. So make a note on your calendar now, and keep tabs on your moonrise and moonset times, because the next time we'll be able to see one of these won't happen for about two years!
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.
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On this day in history:
On this day in 1978, three balloonists from Albuquerque, New Mexico, touched down in a French wheat field after 137 hours in the air, completing the first crossing of the Atlantic by balloon after 17 earlier attempts had failed.
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:
A weak front will bring a chance for a few scattered thunderstorms this afternoon, mainly across interior areas of northern New England. Fog will become widespread tonight behind the front, with another chance for a few showers or storms Tuesday. The rest of the week looks relatively quiet, with only a couple chances for light rain
Key Messages:
- A weak frontal passage this afternoon will allow for a few scattered thunderstorms, mainly across the interior. Nearly widespread patchy fog will develop behind the front. Very weak instability Tuesday could also lead to an isolated shower or storm across the interior.
- Low-impact weather is expected through the middle and latter part of the week, with a couple chances for light rain.
What has changed since the last Forecast Update?
Minimal changes have been made to the ongoing forecast at this time.
What this means for you:
Expect a humid and unsettled afternoon, with scattered showers and thunderstorms possible, especially away from the coast. Most storms should be weak, although a few stronger storms could produce gusty winds. There is no significant flooding threat expected. Fog will become more widespread tonight and could linger into Wednesday morning in some areas. Mid to late week should bring generally low-impact weather.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
**Area Forecast Discussion, National Weather Service Gray ME, 317 PM EDT
Monday, August 17, 2026**
**What has changed**
Minimal changes have been made to the ongoing forecast at this time.
**Key Messages**
1. A weak frontal passage this afternoon will allow for a few scattered thunderstorms, mainly across the interior. Nearly widespread patchy fog will develop behind the front. Very weak instability Tuesday could also lead to an isolated shower or storm across the interior.
2. Low-impact weather is expected through the middle and latter part of the week, with a couple chances for light rain.
**Discussion**
A cloudy and very humid day has developed across northern New England. Thick cloud cover should gradually thin during the afternoon as the low clouds mix out. The additional sunshine will allow a marginal environment for thunderstorms to develop ahead of a very weak cold front.
CAPE, or Convective Available Potential Energy, is expected to be around 300 to 500 J/kg. This is a measure of how much energy is available to help thunderstorms develop. Combined with weak low-level wind shear, storms should be slow-moving. A few stronger storms could produce gusty winds, but the storms should not be slow enough to create a flooding threat.
The front is expected to stall across interior New Hampshire and Maine Tuesday morning, allowing showers to continue across the interior.
Scattered showers and thunderstorms could continue Tuesday afternoon as the front becomes nearly stationary. Activity should remain fairly scattered because low clouds and fog tonight could limit how much additional shower and thunderstorm development occurs Tuesday.
Showers should become more isolated Tuesday night. Additional patchy fog could develop along the Connecticut River Valley and coastal plain, likely lasting until sunrise Wednesday.
**Wednesday through Friday**
A cold front will approach New England Wednesday. Southwest winds ahead of the front will bring warmer temperatures into the lower 80s. However, the front should move through with little fanfare as the larger-scale forcing weakens and moisture becomes less consistent through the atmosphere.
The upper-level trough, or elongated area of lower pressure, should become more pronounced downstream while the embedded wave moving through northern New England becomes less organized. Much of the precipitation should weaken or dissipate to the west, although some moisture could build along the western slopes of the White Mountains. This could produce isolated showers or sprinkles during the late afternoon and evening.
If the front slows further as the parent low pressure system becomes cut off east of Hudson Bay, the boundary could remain across the forecast area or just to the east. This could become the pathway for another area of low pressure moving from the Ohio Valley during the latter part of the week. As a result, precipitation chances Thursday and Friday remain somewhat uncertain.
**Weekend Outlook**
High pressure should approach the region by the weekend. However, the slow-moving boundary mentioned above could complicate the forecast, along with the potential arrival of a cutoff low or upper-level trough from the west.
The combination of the low pressure system and return flow could produce a damp period across much of the Northeast. However, if the low pressure system slows its eastward movement, the first half of the weekend could remain dry.
Weather Summaries and Full Area Forecast Discussions - South (Edited)
Summary - Southern New England - Massachusetts/Northern CT/Rhode Island
Summary:
Tuesday will be fairer, less humid, and gradually clearer, although coastal areas may stay cloudy and foggy much of the day. Inland areas will warm into the 80s, while coastal locations remain cooler. Beachgoers should be especially cautious Tuesday afternoon as a high risk of rip currents develops along east-facing beaches. The rest of the week should not be a washout, but several opportunities for showers return from Wednesday night through the weekend.
Key Messages:
- Fair and less humid Tuesday with gradual clearing. A high risk of rip currents develops across east-facing beaches by Tuesday afternoon.
- No washouts expected, though several opportunities for showers return from mid to late week.
What has changed since the last Forecast Update?
A Rip Current Statement has been issued for east-facing beaches from 9 AM to 8 PM Tuesday.
What this means for you
Tuesday is a good improvement for most of the region, especially inland where it will be warmer and drier. Coastal areas will be cooler, cloudier, and more humid. If you are heading to an east-facing beach Tuesday afternoon, use extra caution in the water and check with lifeguards or beach staff about local rip current conditions. From Wednesday night onward, keep the umbrella handy, as periodic showers become possible, with the greatest chances generally across southern New England.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
**Area Forecast Discussion, National Weather Service Boston/Norton MA
230 PM EDT
Mon Aug 17 2026**
**What has changed**
A Rip Current Statement has been issued for east-facing beaches from 9 AM to 8 PM Tuesday.
**Key Messages**
* Fair and less humid Tuesday with gradual clearing. A high risk of rip currents develops across east-facing beaches by Tuesday afternoon.
* No washouts expected, though several opportunities for showers return from mid to late week.
**Discussion**
**Key Message 1, Fair and less humid Tuesday with gradual clearing**
Gradual clearing will develop from west to east Tuesday as low pressure slowly pulls away from the region. Areas of low clouds and fog may linger for much of the day along the coast because of cyclonic onshore flow, meaning winds circulating around the departing low pressure system will continue pushing moist air inland.
High temperatures should remain in the lower to middle 70s along the coast, with the outer Cape possibly staying in the upper 60s. It will remain fairly humid near the coast as onshore winds bring additional moisture inland.
Farther inland, conditions will be warmer and drier as winds turn toward the northwest during the day. Highs should reach the lower to middle 80s, with heat index values rising into the upper 80s to near 90 degrees for a time Tuesday afternoon.
For those heading to the beach Tuesday afternoon, a Rip Current Statement is in effect for east-facing beaches. Rip currents are powerful channels of water moving away from the shoreline that can quickly pull swimmers away from the beach. Remain aware of local conditions and check with lifeguards or beach staff regarding rip current risks at your specific location.
**Key Message 2, No washouts expected, though several opportunities for showers return from mid to late week**
Generally zonal flow aloft, meaning the upper-level winds will be moving mostly west to east, will prevail Wednesday while an upper-level low tracks well north across Hudson Bay. Conditions are likely to remain dry during the day with temperatures in the lower to middle 80s.
A weak piece of shortwave energy, an area of disturbance moving through the upper atmosphere, will shift in from the west later Wednesday. The stronger forcing will remain farther north and west, but there is a low probability of an isolated shower in western Massachusetts Wednesday night.
Another shortwave moves through Thursday with stronger upward motion and a plume of above-normal moisture, supporting a better chance for showers. There remains some uncertainty among forecast models regarding the exact track of this disturbance.
The ECMWF forecast system favors a more southern track, with higher probabilities, around 60 to 80 percent, for measurable precipitation extending from the south coast into southeastern Massachusetts, Cape Cod, and the Islands. The GEFS and GFS models show a broader area of showers with similar probabilities across southern New England. Any precipitation amounts are likely to range from a trace to a few tenths of an inch.
Friday will feature a post-frontal airmass, meaning cooler and less humid air behind the Thursday system. Temperatures should range from the middle 70s to lower 80s, with humidity decreasing. Eastern coastal areas will likely be toward the cooler end of that range because of easterly onshore winds.
High pressure will build in from the west, bringing generally dry conditions to most of the region. However, forecast models indicate a boundary may stall offshore, with a series of smaller disturbances moving along it from Friday through the weekend.
This could bring periodic chances for showers, along with a few thunderstorms if these disturbances arrive during the warmer part of the day. The higher risk for showers will generally extend from the south coast to Cape Cod and the Islands.
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)
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