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10NM S Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 5:12 am EDT Sep 14, 2026
Forecast Valid: 1pm EDT Sep 14, 2026-6pm EDT Sep 20, 2026

This Afternoon

NNW wind around 25 km/h, with gusts as high as 35 km/h. Sunny. Seas around 1 m.

Tonight

N wind 10 to 15 km/h. Clear. Seas 1 m or less.

Tuesday

N wind around 10 km/h becoming ESE in the afternoon. Sunny. Seas 1 m or less.

Tuesday Night

SSE wind around 10 km/h becoming SSW after midnight. Mostly clear. Seas 1 m or less.

Wednesday

SW wind around 10 km/h. Sunny. Seas 1 m or less.

Wednesday Night

S wind 5 to 10 km/h becoming W after midnight. Partly cloudy. Seas 1 m or less.

Thursday

NNE wind around 10 km/h becoming ESE in the afternoon. Partly sunny. Seas 1 m or less.

Thursday Night

S wind around 10 km/h becoming W after midnight. A chance of showers. Seas around 1 m.

Friday

NNW wind around 10 km/h becoming ENE in the afternoon. Mostly sunny. Seas around 1 m.

*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.