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4NM E Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 8:37 am EDT Apr 18, 2026
Forecast Valid: 2pm EDT Apr 18, 2026-6pm EDT Apr 24, 2026

This Afternoon

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

Tonight

E wind 5 to 10 kt becoming variable and less than 5 kt in the evening. Patchy fog after 1am. Seas around 1 ft.

Sunday

Variable winds 5 kt or less. Rain, mainly after 8am. Areas of fog before 9am. Seas around 1 ft.

Sunday Night

W wind around 10 kt. Rain likely before 11pm. 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

N wind 5 to 10 kt becoming SSE in the afternoon. Sunny. Seas around 1 ft.

Tuesday Night

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

Wednesday

SW wind 5 to 10 kt. Partly sunny. 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.