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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 11:36 pm EDT Apr 12, 2026
Forecast Valid: 2am EDT Apr 13, 2026-6pm EDT Apr 19, 2026

Monday

S wind around 10 kt becoming SW in the morning. Winds could gust as high as 25 kt. A chance of showers, mainly after 2pm. Seas 1 ft or less.

Monday Night

W wind 5 to 10 kt. A slight chance of showers before 7pm. Seas 1 ft or less.

Tuesday

Variable winds 5 kt or less. A slight chance of showers after 3pm. Seas 1 ft or less.

Tuesday Night

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

Wednesday

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

Wednesday Night

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

Thursday

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

Thursday Night

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

Friday

Variable winds 5 kt or less. Partly 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.