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4NM E Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 6:21 am EDT Mar 20, 2026
Forecast Valid: 6am EDT Mar 20, 2026-6pm EDT Mar 26, 2026

Today

W wind 5 to 8 kt becoming S 7 to 10 kt in the afternoon. A slight chance of rain after 4pm. Seas around 1 ft.

Tonight

SSW wind 10 to 15 kt becoming WSW after midnight. Winds could gust as high as 20 kt. Rain likely, mainly before 1am. Seas around 1 ft.

Saturday

NW wind 10 to 15 kt, with gusts as high as 20 kt. A slight chance of rain before 8am. Seas around 1 ft.

Saturday Night

NW wind 5 to 10 kt. Increasing clouds. Seas around 1 ft.

Sunday

S wind 5 to 10 kt. A chance of rain before 7am, then rain and snow likely between 7am and 3pm, then rain likely after 3pm. Seas around 1 ft.

Sunday Night

NNE wind around 10 kt. Rain likely before 11pm, then rain and snow likely. Seas around 1 ft.

Monday

NNE wind 10 to 15 kt, with gusts as high as 20 kt. Rain likely, possibly mixed with snow before 2pm, then a chance of snow. Seas around 1 ft.

Monday Night

NNW wind around 10 kt. Mostly cloudy. Seas around 1 ft.

Tuesday

NNW wind around 10 kt becoming W in the afternoon. Sunny. Seas around 1 ft.

*Notices:

This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.