Portsmouth, NH Weather Forecast and Current Conditions

Day Sky High / Low Precip Wind Humidity
Sun
Jul 19 		Sunny
Close Hourly 		78º / 57º 1% WNW 17 mph 47%
8am Mostly Sunny 69º 1% WNW 16 mph 60%
9am Mostly Sunny 70º 1% WNW 17 mph 55%
10am Mostly Sunny 72º 0% WNW 17 mph 51%
11am Sunny 73º 0% WNW 15 mph 51%
12pm Sunny 75º 0% WNW 16 mph 47%
1pm Sunny 76º 0% WNW 16 mph 44%
2pm Sunny 77º 0% WNW 14 mph 41%
3pm Sunny 78º 0% WNW 13 mph 39%
4pm Sunny 77º 0% WNW 13 mph 38%
5pm Sunny 76º 0% WNW 13 mph 38%
6pm Sunny 76º 0% WNW 12 mph 38%
7pm Sunny 74º 0% WNW 10 mph 41%
8pm Sunny 71º 0% WNW 8 mph 44%
9pm Clear 69º 0% WNW 7 mph 51%
10pm Clear 67º 0% WNW 6 mph 54%
11pm Clear 66º 0% WNW 5 mph 55%
Mon
Jul 20 		Mostly Sunny
View Hourly 		80º / 61º 1% WSW 9 mph 49%
12am Clear 64º 1% WNW 5 mph 59%
1am Clear 63º 1% WNW 5 mph 61%
2am Clear 62º 1% WNW 5 mph 64%
3am Clear 61º 2% WNW 5 mph 67%
4am Clear 59º 2% W 4 mph 73%
5am Clear 58º 3% W 4 mph 76%
6am Sunny 58º 3% W 4 mph 75%
7am Sunny 62º 2% W 5 mph 69%
8am Sunny 66º 1% W 5 mph 63%
9am Sunny 69º 0% W 6 mph 57%
10am Sunny 73º 0% WNW 6 mph 50%
11am Sunny 75º 0% WNW 6 mph 45%
12pm Mostly Sunny 77º 0% W 7 mph 42%
1pm Partly Cloudy 78º 0% WSW 7 mph 41%
2pm Partly Cloudy 78º 0% SW 7 mph 42%
3pm Partly Cloudy 78º 0% SSW 8 mph 43%
4pm Partly Cloudy 78º 0% S 8 mph 44%
5pm Mostly Sunny 76º 0% S 9 mph 45%
6pm Mostly Sunny 76º 0% S 9 mph 47%
7pm Partly Cloudy 74º 1% S 7 mph 53%
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 70%
11pm Mostly Clear 68º 2% S 5 mph 70%
Tue
Jul 21 		PM Showers
View Hourly 		75º / 67º 59% SSE 15 mph 70%
12am Partly Cloudy 66º 2% SSW 4 mph 72%
1am Partly Cloudy 65º 2% SSW 4 mph 74%
2am Partly Cloudy 65º 3% SSW 4 mph 76%
3am Mostly Cloudy 64º 3% SSW 4 mph 77%
4am Mostly Cloudy 63º 4% SSW 4 mph 80%
5am Mostly Cloudy 62º 5% SSW 4 mph 82%
6am Cloudy 63º 6% S 4 mph 84%
7am Cloudy 65º 5% S 5 mph 81%
Wed
Jul 22 		Thunderstorms 81º / 61º 73% SSW 11 mph 79%
Thu
Jul 23 		Mostly Sunny 80º / 59º 5% W 9 mph 57%
Fri
Jul 24 		Sunny 80º / 61º 5% SSW 8 mph 59%
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) 161613854578544
    12pm4pm8pm12am4am8am12pm4pm8pm12am4am8am
    MPH 161613854578544
    DIR WNWWNWWNWWNWWNWWWWSSSSWSSW

    Current Weather Conditions In Portsmouth, NH

    As Of: 52 minutes ago

    • 69ºF
    • 69ºF
    • 16mph
    • 0º (WNW)
    • 29mph
    • Mostly Sunny
    • 10mi
    • 29.62"
    • 60%
    • 0ºF

    The weather right now in Portsmouth, NH is Mostly Sunny. The current temperature is 69°F, and the expected high and low for today, Sunday, July 19, 2026, are 78° 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 29 mph. With the wind and the atmosphere the temperature feels like 69° Fahrenheit. Expected precipitation is 1 percent, with current humidity at 60 percent, and air pressure at 29.62 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.

    &&