Portsmouth, NH Weather Forecast and Current Conditions

Day Sky High / Low Precip Wind Humidity
Sun
Jul 19 		Sunny
Close Hourly 		79º / 57º 1% WNW 17 mph 45%
9am Mostly Sunny 70º 1% WNW 16 mph 55%
10am Mostly Sunny 71º 0% WNW 17 mph 51%
11am Sunny 73º 0% WNW 17 mph 48%
12pm Sunny 75º 0% WNW 16 mph 47%
1pm Sunny 76º 0% WNW 15 mph 44%
2pm Sunny 77º 0% WNW 14 mph 41%
3pm Sunny 78º 0% WNW 13 mph 39%
4pm Sunny 78º 0% WNW 13 mph 37%
5pm Sunny 77º 0% WNW 13 mph 37%
6pm Sunny 76º 0% WNW 12 mph 38%
7pm Sunny 74º 0% WNW 11 mph 40%
8pm Sunny 72º 0% WNW 8 mph 44%
9pm Clear 69º 0% WNW 7 mph 51%
10pm Clear 67º 0% WNW 7 mph 53%
11pm Clear 66º 0% WNW 6 mph 55%
Mon
Jul 20 		Mostly Sunny
View Hourly 		80º / 62º 2% WSW 9 mph 48%
12am Clear 65º 0% WNW 6 mph 58%
1am Clear 64º 1% WNW 5 mph 60%
2am Clear 62º 1% WNW 5 mph 63%
3am Clear 61º 2% W 5 mph 67%
4am Clear 60º 2% W 5 mph 70%
5am Clear 58º 3% W 4 mph 74%
6am Sunny 58º 3% W 4 mph 75%
7am Sunny 63º 2% W 5 mph 69%
8am Sunny 66º 1% W 5 mph 62%
9am Sunny 70º 0% W 6 mph 57%
10am Sunny 73º 0% W 6 mph 49%
11am Sunny 76º 0% WNW 6 mph 44%
12pm Mostly Sunny 77º 0% W 7 mph 41%
1pm Partly Cloudy 78º 0% WSW 7 mph 40%
2pm Partly Cloudy 79º 0% SW 7 mph 42%
3pm Partly Cloudy 79º 0% SSW 7 mph 42%
4pm Partly Cloudy 78º 0% S 8 mph 44%
5pm Mostly Sunny 78º 0% S 9 mph 44%
6pm Mostly Sunny 76º 0% S 8 mph 47%
7pm Partly Cloudy 74º 1% S 7 mph 52%
8pm Partly Cloudy 72º 2% S 5 mph 58%
9pm Partly Cloudy 70º 3% S 5 mph 64%
10pm Mostly Clear 68º 3% S 4 mph 69%
11pm Mostly Clear 68º 3% S 5 mph 69%
Tue
Jul 21 		PM Showers
View Hourly 		77º / 67º 43% SSE 15 mph 68%
12am Partly Cloudy 67º 2% SSW 4 mph 71%
1am Partly Cloudy 66º 2% SSW 4 mph 74%
2am Mostly Cloudy 65º 3% SSW 5 mph 76%
3am Mostly Cloudy 64º 4% SSW 4 mph 77%
4am Mostly Cloudy 63º 4% SSW 4 mph 79%
5am Mostly Cloudy 63º 5% SSW 4 mph 80%
6am Cloudy 63º 6% S 4 mph 83%
7am Cloudy 66º 5% S 5 mph 80%
8am Cloudy 68º 6% S 6 mph 77%
Wed
Jul 22 		Thunderstorms 81º / 61º 72% SSW 11 mph 78%
Thu
Jul 23 		Mostly Sunny 80º / 59º 5% W 9 mph 57%
Fri
Jul 24 		Sunny 80º / 62º 5% SSW 8 mph 58%
Sat
Jul 25 		Mostly Sunny 81º / 63º 4% SSW 9 mph 60%
Sun
Jul 26 		Partly Cloudy 79º / 64º 18% SSW 9 mph 58%

Weather Radar for Portsmouth, NH See Radar

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* Playback displays weather for the past 6 hours.

NOAA Weather Marine Forecast for Portsmouth, NH

Today
High : 73ºF
WNW wind around 10 kt, with gusts as high as 20 kt. Sunny. Seas 1 ft or less.
Tonight
Low : 61ºF
Variable winds 5 kt or less. Clear. Seas 1 ft or less.
Monday
High : 74ºF
Variable winds 5 kt or less. Sunny. Seas 1 ft or less.
Monday Night
Low : 62ºF
Variable winds 5 kt or less. Increasing clouds. Seas 1 ft or less.
Tuesday
High : 71ºF
SSE wind 5 to 10 kt increasing to 10 to 15 kt in the afternoon. Winds could gust as high as 25 kt. Mostly cloudy. Seas 1 ft or less.
Tuesday Night
Low : 64ºF
SE wind around 10 kt, with gusts as high as 20 kt. Showers and thunderstorms likely before 11pm, then showers and possibly a thunderstorm between 11pm and 2am, then showers after 2am. Seas 1 ft or less.
Wednesday
High : 74ºF
S wind 5 to 10 kt. Showers likely, then showers and possibly a thunderstorm after 2pm. Seas 1 ft or less.
Wednesday Night
Low : 62ºF
WSW wind 5 to 10 kt. Showers likely and possibly a thunderstorm. Seas 1 ft or less.
Thursday
High : 72ºF
Variable winds 5 kt or less. A chance of showers. Seas 1 ft or less.

NOAA Buoy Data Near Portsmouth, NH See Map

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    Wind Speed Forecast for Portsmouth, NH

    SundayMondayTuesday
    Wind Speed (MPH) 161513754679544
    1pm5pm9pm1am5am9am1pm5pm9pm1am5am9am
    MPH 161513754679544
    DIR WNWWNWWNWWNWWNWWWWSWSSSSWSSW

    Current Weather Conditions In Portsmouth, NH

    As Of: 40 minutes ago

    • 70ºF
    • 70ºF
    • 16mph
    • 0º (WNW)
    • 28mph
    • Mostly Sunny
    • 10mi
    • 29.64"
    • 55%
    • 0ºF

    The weather right now in Portsmouth, NH is Mostly Sunny. The current temperature is 70°F, and the expected high and low for today, Sunday, July 19, 2026, are 79° high temperature and 57°F low temperature. The wind is currently blowing at 16 miles per hour, and coming from the West Northwest. The wind is gusting to 28 mph. With the wind and the atmosphere the temperature feels like 70° Fahrenheit. Expected precipitation is 1 percent, with current humidity at 55 percent, and air pressure at 29.64 in. Visibility is 10 nautical miles. There are 1 current weather alert(s).

     

    Weather Alerts
    Small Craft Advisory - 6:53am Sun Jul 19 2026

    ...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

    WHAT: Northwest winds around 15 kt with gusts up to 25 kt and
    seas 3 to 6 ft.

    WHERE: Coastal Waters from Stonington, ME to Port Clyde, ME
    out 25 NM, Coastal Waters from Port Clyde, ME to Cape
    Elizabeth, ME out 25 NM and Coastal Waters from Cape
    Elizabeth, ME to Merrimack River, MA out 25 NM.

    WHEN: Until 2 PM EDT this afternoon.

    IMPACTS: Conditions will be hazardous to small craft.

    PRECAUTIONARY / PREPAREDNESS ACTIONS:

    Inexperienced mariners, especially those operating smaller
    vessels, should avoid navigating in hazardous conditions.

    &&