For More Weather Information:

6NM SSE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 1:59 am EDT Mar 18, 2026
Forecast Valid: 9am EDT Mar 18, 2026-6pm EDT Mar 24, 2026

Today

W wind 7 to 10 kt decreasing to 5 to 8 kt in the afternoon. Increasing clouds. Seas around 4 ft.

Tonight

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

Thursday

SSE wind 5 to 10 kt. Mostly sunny. Seas around 3 ft.

Thursday Night

S wind 5 to 10 kt becoming SSW after midnight. Partly cloudy. Seas around 3 ft.

Friday

WSW wind 5 to 10 kt becoming SSW in the afternoon. Mostly sunny. Seas 2 to 3 ft.

Friday Night

SSW wind 5 to 10 kt. A chance of rain after 2am. Seas 2 to 3 ft.

Saturday

S wind around 10 kt becoming SW in the afternoon. A chance of rain. Seas around 3 ft.

Saturday Night

SW wind around 10 kt. A chance of rain. Seas around 4 ft.

Sunday

SW wind 10 to 15 kt becoming WNW in the afternoon. 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.