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4NM E Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 2:35 pm EDT Apr 18, 2026
Forecast Valid: 3pm EDT Apr 18, 2026-6pm EDT Apr 25, 2026

This Afternoon

E wind around 10 kt. Mostly cloudy. Seas around 1 ft.

Tonight

E wind 5 to 10 kt. Patchy fog after 10pm. Seas around 1 ft.

Sunday

SSE wind 5 to 10 kt becoming WNW in the afternoon. Rain, mainly after 11am. Patchy fog between noon and 2pm. Seas around 1 ft.

Sunday Night

W wind 5 to 10 kt. Rain likely, mainly before 7pm. Seas around 1 ft.

Monday

W wind 5 to 10 kt. Mostly sunny. Seas around 1 ft.

Monday Night

N wind around 10 kt. Partly cloudy. Seas around 1 ft.

Tuesday

Variable winds 5 kt or less. Sunny. Seas around 1 ft.

Tuesday Night

S wind around 10 kt becoming SSW after midnight. Mostly cloudy. Seas around 1 ft.

Wednesday

SSW wind 5 to 10 kt. Mostly cloudy. 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.