Forecast

    Forecast for Portsmouth, NH | Forecast Periods: 14
    Monday
    Mar 16
    2026

    Portsmouth, NH

    Updated: 2:29 PM EDT

    55°F

    Light Rain Likely

    15 mph SE
    Precipitation: 61%

    Rain likely and isolated thunderstorms. Cloudy, with a high near 55. Southeast wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

    Hourly Forecast

    MON16:00
    52°F
    Light Rain Likely
    Dewpoint:11.1°Precip:61%Humidity:100%Wind:15 mph SE
    MON17:00
    53°F
    Light Rain Likely
    Dewpoint:11.1°Precip:57%Humidity:96%Wind:15 mph SE
    MON18:00
    55°F
    Light Rain Likely
    Dewpoint:11.1°Precip:64%Humidity:90%Wind:15 mph SE
    MON19:00
    55°F
    Light Rain
    Dewpoint:10.6°Precip:83%Humidity:86%Wind:20 mph SE
    TUE20:00
    55°F
    Light Rain
    Dewpoint:10.6°Precip:78%Humidity:86%Wind:20 mph SE
    TUE21:00
    57°F
    Light Rain
    Dewpoint:11.1°Precip:83%Humidity:83%Wind:20 mph SE
    TUE22:00
    58°F
    Light Rain
    Dewpoint:10.6°Precip:100%Humidity:77%Wind:15 mph SE
    TUE23:00
    58°F
    Light Rain
    Dewpoint:11.1°Precip:83%Humidity:80%Wind:20 mph S
    TUE00:00
    58°F
    Light Rain
    Dewpoint:10.6°Precip:78%Humidity:77%Wind:20 mph S
    TUE01:00
    59°F
    Light Rain
    Dewpoint:11.1°Precip:78%Humidity:78%Wind:20 mph S
    TUE02:00
    59°F
    Light Rain
    Dewpoint:11.1°Precip:79%Humidity:78%Wind:20 mph S
    TUE03:00
    57°F
    Light Rain
    Dewpoint:10.6°Precip:77%Humidity:80%Wind:20 mph S
    TUE04:00
    55°F
    Light Rain Likely
    Dewpoint:10.6°Precip:70%Humidity:86%Wind:20 mph S
    TUE05:00
    53°F
    Chance Light Rain
    Dewpoint:8.9°Precip:29%Humidity:83%Wind:20 mph SW
    TUE06:00
    49°F
    Mostly Cloudy
    Dewpoint:6.1°Precip:9%Humidity:80%Wind:15 mph SW
    TUE07:00
    44°F
    Mostly Cloudy
    Dewpoint:3.9°Precip:2%Humidity:82%Wind:15 mph SW
    TUE08:00
    40°F
    Mostly Sunny
    Dewpoint:0.6°Precip:3%Humidity:76%Wind:15 mph W
    TUE09:00
    40°F
    Sunny
    Dewpoint:-2.2°Precip:0%Humidity:62%Wind:15 mph W
    TUE10:00
    40°F
    Mostly Sunny
    Dewpoint:-4.4°Precip:2%Humidity:52%Wind:15 mph W
    TUE11:00
    39°F
    Sunny
    Dewpoint:-5.6°Precip:0%Humidity:50%Wind:20 mph W
    TUE12:00
    38°F
    Sunny
    Dewpoint:-6.7°Precip:0%Humidity:48%Wind:20 mph W
    TUE13:00
    37°F
    Sunny
    Dewpoint:-7.8°Precip:0%Humidity:46%Wind:15 mph W
    TUE14:00
    38°F
    Sunny
    Dewpoint:-8.3°Precip:0%Humidity:42%Wind:15 mph W
    TUE15:00
    39°F
    Mostly Sunny
    Dewpoint:-8.3°Precip:0%Humidity:40%Wind:15 mph W

    Extended Forecast

    Tonight

    Mon, Mar 16
    40°F
    Light Rain
    15 mph S
    Precipitation: 100%
    Rain and isolated thunderstorms. Cloudy. Low around 40, with temperatures rising to around 53 overnight. South wind 15 to 20 mph, with gusts as high as 45 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Tuesday

    Tue, Mar 17
    45°F
    Mostly Sunny
    15 mph W
    Precipitation: 9%
    Mostly sunny. High near 45, with temperatures falling to around 39 in the afternoon. West wind 15 to 20 mph, with gusts as high as 40 mph. New rainfall amounts less than a tenth of an inch possible.

    Tuesday Night

    Tue, Mar 17
    19°F
    Mostly Clear
    10 mph W
    Precipitation: 0%
    Mostly clear, with a low around 19. West wind 10 to 15 mph, with gusts as high as 30 mph.

    Wednesday

    Wed, Mar 18
    37°F
    Mostly Sunny
    5 mph W
    Precipitation: 0%
    Mostly sunny, with a high near 37. West wind 5 to 10 mph.

    Wednesday Night

    Wed, Mar 18
    24°F
    Mostly Cloudy
    5 mph S
    Precipitation: 1%
    Mostly cloudy, with a low around 24.

    Thursday

    Thu, Mar 19
    41°F
    Mostly Sunny
    5 mph S
    Precipitation: 3%
    Mostly sunny, with a high near 41.

    Thursday Night

    Thu, Mar 19
    28°F
    Mostly Cloudy then Slight Chance Light Snow
    5 mph S
    Precipitation: 19%
    A slight chance of snow between 2am and 5am, then a slight chance of rain. Mostly cloudy, with a low around 28.

    Friday

    Fri, Mar 20
    48°F
    Slight Chance Light Snow then Slight Chance Light Rain
    5 mph SW
    Precipitation: 20%
    A slight chance of rain before 8am, then a slight chance of snow between 8am and 11am, then a slight chance of rain. Mostly sunny, with a high near 48.

    Friday Night

    Fri, Mar 20
    28°F
    Chance Light Rain then Chance Rain And Snow
    5 mph W
    Precipitation: 39%
    A chance of rain before 5am, then a chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.

    Saturday

    Sat, Mar 21
    43°F
    Chance Rain And Snow
    5 mph NW
    Precipitation: 47%
    A chance of rain and snow. Partly sunny, with a high near 43. Chance of precipitation is 50%.

    Saturday Night

    Sat, Mar 21
    26°F
    Chance Rain And Snow
    10 mph SW
    Precipitation: 41%
    A chance of rain and snow. Mostly cloudy, with a low around 26. Chance of precipitation is 40%.

    Sunday

    Sun, Mar 22
    41°F
    Chance Light Snow
    10 mph W
    Precipitation: 29%
    A chance of snow. Mostly cloudy, with a high near 41. Chance of precipitation is 30%.

    Sunday Night

    Sun, Mar 22
    24°F
    Chance Light Snow
    10 mph W
    Precipitation: 27%
    A chance of snow. Mostly cloudy, with a low around 24.

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