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4NM E Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 9:11 am EDT May 18, 2026
Forecast Valid: 10am EDT May 18, 2026-6pm EDT May 24, 2026

Today

Variable winds 5 kt or less. Mostly sunny. Seas around 1 ft.

Tonight

Variable winds 5 kt or less. Mostly clear. Seas around 1 ft.

Tuesday

SSW wind 5 to 10 kt. A slight chance of showers after 4pm. Seas around 1 ft.

Tuesday Night

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

Wednesday

W wind around 10 kt. A chance of showers after 2pm. Seas around 1 ft.

Wednesday Night

NW wind around 10 kt. A chance of showers before 8pm. Seas around 1 ft.

Thursday

NNW wind 5 to 10 kt becoming WSW in the afternoon. Mostly sunny. Seas around 1 ft.

Thursday Night

Variable winds 5 kt or less. Mostly clear. Seas around 1 ft.

Friday

NNW wind 5 to 8 kt becoming SSE 7 to 10 kt in the afternoon. Mostly 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.