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13NM S Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 5:35 am EDT Sep 19, 2026
Forecast Valid: 6am EDT Sep 19, 2026-6pm EDT Sep 25, 2026

Today

N wind 5 to 10 kt becoming ESE in the afternoon. Mostly sunny. Seas 1 ft or less.

Tonight

Variable winds 5 kt or less. Partly cloudy. Seas 1 ft or less.

Sunday

S wind 5 to 10 kt becoming SE in the afternoon. Rain, mainly after 2pm. Seas 1 ft or less.

Sunday Night

E wind 5 to 10 kt becoming N after midnight. Winds could gust as high as 20 kt. Rain, mainly before 2am. Seas 1 ft or less.

Monday

N wind 5 to 10 kt becoming NE in the afternoon. Winds could gust as high as 20 kt. Mostly sunny. Seas 1 ft or less.

Monday Night

NNE wind 5 to 8 kt increasing to 7 to 10 kt after midnight. Mostly cloudy. Seas 1 ft or less.

Tuesday

NE wind 10 to 15 kt, with gusts as high as 25 kt. Partly sunny. Seas 1 ft or less.

Tuesday Night

NE wind 5 to 10 kt. Mostly cloudy. Seas 1 ft or less.

Wednesday

ENE wind around 15 kt, with gusts as high as 30 kt. Mostly sunny. Seas 1 ft or less.

*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.