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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 2:29 pm EDT May 4, 2026
Forecast Valid: 8pm EDT May 4, 2026-6pm EDT May 11, 2026

Tonight

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

Tuesday

SSW wind 5 to 10 kt increasing to 10 to 15 kt in the afternoon. Winds could gust as high as 20 kt. Sunny. Seas 1 ft or less.

Tuesday Night

SSW wind 5 to 10 kt. Increasing clouds. Seas 1 ft or less.

Wednesday

S wind 5 to 10 kt, with gusts as high as 20 kt. Rain likely, mainly after 4pm. Seas 1 ft or less.

Wednesday Night

S wind 5 to 10 kt becoming SW after midnight. Rain, mainly before 2am. Seas 1 ft or less.

Thursday

Variable winds 5 kt or less. A chance of showers before 10am. Seas 1 ft or less.

Thursday Night

Variable winds 5 kt or less. A chance of showers between 10pm and 1am. Seas 1 ft or less.

Friday

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

Friday Night

Variable winds 5 kt or less. Mostly clear. 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.