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8NM SE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 6:51 am EDT Mar 17, 2026
Forecast Valid: 11am EDT Mar 17, 2026-6pm EDT Mar 23, 2026

Today

W wind around 20 kt, with gusts as high as 30 kt. Sunny. Seas 5 to 6 ft.

Tonight

WNW wind around 20 kt, with gusts as high as 30 kt. Mostly clear. Seas 4 to 5 ft.

Wednesday

WNW wind 10 to 15 kt becoming W 5 to 8 kt in the afternoon. Winds could gust as high as 20 kt. Mostly sunny. Seas 3 to 4 ft.

Wednesday Night

S wind 10 to 15 kt. Partly cloudy. Seas around 3 ft.

Thursday

S wind 10 to 15 kt. Mostly sunny. Seas around 3 ft.

Thursday Night

S wind 10 to 15 kt becoming SSW after midnight. Winds could gust as high as 20 kt. Mostly cloudy. Seas around 3 ft.

Friday

SW wind 10 to 15 kt becoming S in the afternoon. Partly sunny. Seas 2 to 3 ft.

Friday Night

SW wind around 15 kt, with gusts as high as 20 kt. A chance of snow after 5am. Seas 2 to 3 ft.

Saturday

WNW wind 15 to 20 kt. A chance of rain and snow before 11am, then a chance of rain. Seas around 3 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.