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4NM E Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 5:04 am EDT Mar 17, 2026
Forecast Valid: 6am EDT Mar 17, 2026-6pm EDT Mar 23, 2026

Today

SSW wind 15 to 20 kt becoming W in the afternoon. Winds could gust as high as 30 kt. A chance of showers, mainly before 7am. Seas 1 to 2 ft.

Tonight

W wind around 15 kt, with gusts as high as 25 kt. Mostly clear. Seas around 2 ft.

Wednesday

WNW wind 7 to 10 kt becoming W 5 to 8 kt in the afternoon. Increasing clouds. Seas around 2 ft.

Wednesday Night

S wind 5 to 10 kt. Partly cloudy. Seas around 2 ft.

Thursday

SSE wind 5 to 10 kt. Mostly sunny. Seas around 2 ft.

Thursday Night

S wind around 10 kt becoming SSW after midnight. Mostly cloudy. Seas around 2 ft.

Friday

SW wind around 10 kt. Partly sunny. Seas 1 to 2 ft.

Friday Night

SW wind around 10 kt. A chance of rain after 3am, mixing with snow after 5am. Seas around 1 ft.

Saturday

NW wind around 10 kt. A chance of rain and snow before 11am, then a chance of rain. 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.