National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Pease Air Force Base / Portsmouth (KPSM)

Lat: 43.08°NLon: 70.82°WElev: 102ft.

Mostly Cloudy

87°F

31°C

Humidity 39%
Wind Speed W 8 mph
Barometer 29.94 in (1014.1 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 20 Aug 2:55 pm EDT
Extended Forecast for

Portsmouth NH

  • Tonight

    Tonight: A 40 percent chance of showers, mainly before 11pm. Mostly cloudy, with a low around 61. South wind around 5 mph becoming calm. New precipitation amounts of less than a tenth of an inch possible.

    Low: 61 °F

    Chance
    Showers

  • Friday

    Friday: Partly sunny, with a high near 76. Northeast wind 5 to 10 mph.

    High: 76 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 59. Calm wind becoming northeast around 5 mph.

    Low: 59 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: Showers likely between 10am and 2pm, then rain likely after 2pm. Mostly cloudy, with a high near 73. Northeast wind 5 to 10 mph. Chance of precipitation is 60%.

    High: 73 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Rain likely. Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 61 °F

    Rain Likely
    and Patchy
    Fog

  • Sunday

    Sunday: A 50 percent chance of showers. Areas of fog before 8am. Otherwise, mostly cloudy, with a high near 78.

    High: 78 °F

    Chance
    Showers and
    Areas Fog

  • Sunday Night

    Sunday Night: A 40 percent chance of showers before midnight. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    Showers then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
A 40 percent chance of showers, mainly before 11pm. Mostly cloudy, with a low around 61. South wind around 5 mph becoming calm. New precipitation amounts of less than a tenth of an inch possible.
Friday
Partly sunny, with a high near 76. Northeast wind 5 to 10 mph.
Friday Night
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 59. Calm wind becoming northeast around 5 mph.
Saturday
Showers likely between 10am and 2pm, then rain likely after 2pm. Mostly cloudy, with a high near 73. Northeast wind 5 to 10 mph. Chance of precipitation is 60%.
Saturday Night
Rain likely. Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.
Sunday
A 50 percent chance of showers. Areas of fog before 8am. Otherwise, mostly cloudy, with a high near 78.
Sunday Night
A 40 percent chance of showers before midnight. Mostly cloudy, with a low around 63.
Monday
Mostly sunny, with a high near 81.
Monday Night
Mostly clear, with a low around 57.
Tuesday
Sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 62.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth NH
 43.03°N 70.79°W (Elev. 59 ft)
Last Update:
2:49 pm EDT Aug 20, 2026
Forecast Valid:
3pm EDT Aug 20, 2026-6pm EDT Aug 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation