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10NM S Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 2:31 pm EDT Oct 13, 2026
Forecast Valid: 6pm EDT Oct 13, 2026-6pm EDT Oct 20, 2026

Tonight

SSE wind 5 to 10 kt becoming SW after midnight. A chance of rain and thunderstorms, mainly before midnight. Areas of dense fog. Seas 3 to 4 ft.

Wednesday

WSW wind around 10 kt becoming WNW in the afternoon. Patchy dense fog before 9am. Seas around 3 ft.

Wednesday Night

NW wind 10 to 15 kt. Mostly clear. Seas 2 to 3 ft.

Thursday

NNW wind 7 to 10 kt decreasing to 5 to 8 kt in the afternoon. Sunny. Seas around 2 ft.

Thursday Night

Variable winds 5 kt or less. A chance of showers after 4am. Seas around 1 ft.

Friday

SSE wind 10 to 15 kt. Showers, mainly after 8am. Seas 1 to 2 ft.

Friday Night

WNW wind 15 to 20 kt, with gusts as high as 30 kt. Showers likely, mainly before 11pm. Seas 2 to 3 ft.

Saturday

WNW wind 20 to 25 kt, with gusts as high as 30 kt. Mostly sunny. Seas around 2 ft.

Saturday Night

W wind 10 to 15 kt, with gusts as high as 20 kt. Mostly clear. Seas around 1 ft.

Winds and seas higher in and near tstms.

*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.