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20NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 6:26 am EDT Oct 19, 2026
Forecast Valid: 10am EDT Oct 19, 2026-6pm EDT Oct 25, 2026

Today

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

Tonight

Variable winds 5 kt or less. Mostly cloudy. Seas 1 to 2 ft.

Tuesday

N wind around 10 kt. Partly sunny. Seas 3 ft building to 5 ft.

Tuesday Night

NNE wind around 10 kt. Partly cloudy. Seas around 5 ft.

Wednesday

NNE wind around 10 kt. Sunny. Seas around 5 ft.

Wednesday Night

Variable winds 5 kt or less. Partly cloudy. Seas around 5 ft.

Thursday

Variable winds 5 kt or less. Sunny. Seas 5 to 6 ft.

Thursday Night

N wind around 10 kt. Mostly clear. Seas 5 to 6 ft.

Friday

N wind around 10 kt. Sunny. Seas around 4 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.