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

23°C

74°F

Humidity 75%
Wind Speed SE 17 km/h
Barometer 1019.5 mb (30.10 in)
Dewpoint 19°C (66°F)
Visibility 16 km
Last update 13 Jul 1:55 pm EDT
Extended Forecast for

Portsmouth NH

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 23. Southeast wind 10 to 15 km/h.

    High: 23 °C

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 18. South wind 5 to 10 km/h.

    Low: 18 °C

    Patchy Fog

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Areas of fog before 8am. Otherwise, mostly cloudy, with a high near 28. South wind around 10 km/h. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    High: 28 °C

    Areas Fog
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 20. Calm wind.

    Low: 20 °C

    Chance
    T-storms then
    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 31. West wind 5 to 10 km/h becoming south in the afternoon.

    High: 31 °C

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 20.

    Low: 20 °C

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 32.

    High: 32 °C

    Hot

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 22.

    Low: 22 °C

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny and hot, with a high near 32.

    High: 32 °C

    Partly Sunny
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 23. Southeast wind 10 to 15 km/h.
Tonight
Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 18. South wind 5 to 10 km/h.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Areas of fog before 8am. Otherwise, mostly cloudy, with a high near 28. South wind around 10 km/h. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.
Monday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 20. Calm wind.
Tuesday
Mostly sunny, with a high near 31. West wind 5 to 10 km/h becoming south in the afternoon.
Tuesday Night
Mostly clear, with a low around 20.
Wednesday
Mostly sunny and hot, with a high near 32.
Wednesday Night
Partly cloudy, with a low around 22.
Thursday
A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny and hot, with a high near 32.
Thursday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 21.
Friday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 31.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 19.
Saturday
Partly sunny, with a high near 27.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth NH
 43.05°N 70.78°W (Elev. 49 m)
Last Update:
1:45 pm EDT Jul 13, 2025
Forecast Valid:
2pm EDT Jul 13, 2025-6pm EDT Jul 19, 2025
 
Forecast Discussion
 
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Additional Resources

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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