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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 2:31 pm EDT Mar 29, 2026
Forecast Valid: 6pm EDT Mar 29, 2026-6pm EDT Apr 5, 2026

Tonight

Variable winds 5 kt or less. Increasing clouds. Seas 1 ft or less.

Monday

SW wind 5 to 10 kt. Cloudy, then gradually becoming mostly sunny. Seas 1 ft or less.

Monday Night

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

Tuesday

Variable winds 5 kt or less. A chance of rain after 7am. Seas 1 ft or less.

Tuesday Night

Variable winds 5 kt or less. A chance of rain. Patchy fog after 11pm. Seas 1 ft or less.

Wednesday

SW wind around 10 kt becoming W in the afternoon. Showers likely, mainly after 2pm. Seas 1 ft or less.

Wednesday Night

Variable winds 5 kt or less. Rain likely, mainly before 7pm. Seas 1 ft or less.

Thursday

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

Thursday Night

Variable winds 5 kt or less. Rain and snow likely, mainly after 1am. 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.