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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 10:57 pm EDT May 21, 2025
Forecast Valid: 2am EDT May 22, 2025-6pm EDT May 28, 2025

Thursday

E wind 10 to 15 kt increasing to 15 to 20 kt in the afternoon. Winds could gust as high as 30 kt. Rain, mainly after 2pm. Seas 1 ft or less.

Thursday Night

NE wind around 20 kt, with gusts as high as 35 kt. Rain. Seas 1 ft or less.

Friday

NNE wind 12 to 15 kt becoming NNW 10 to 13 kt in the afternoon. Winds could gust as high as 30 kt. Rain, mainly before 1pm. Seas 1 ft or less.

Friday Night

Variable winds 5 kt or less. A chance of showers after 2am. Seas 1 ft or less.

Saturday

Variable winds 5 kt or less. A chance of showers. Seas 1 ft or less.

Saturday Night

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

Sunday

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

Sunday Night

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

Memorial Day

Variable winds 5 kt or less. 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.