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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 2:43 pm EDT Mar 22, 2026
Forecast Valid: 6pm EDT Mar 22, 2026-6pm EDT Mar 29, 2026

Tonight

Variable winds 5 kt or less. A chance of rain before 2am, then a chance of snow. Seas 1 ft or less.

Monday

NNE wind around 10 kt. A chance of snow, mainly after 5pm. Seas 1 ft or less.

Monday Night

Variable winds 5 kt or less. A chance of snow, mainly before 9pm. Seas 1 ft or less.

Tuesday

Variable winds 5 kt or less. Sunny. Seas 1 ft or less.

Tuesday Night

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

Wednesday

SW wind 5 to 10 kt. Partly sunny. Seas 1 ft or less.

Wednesday Night

Variable winds 5 kt or less. Mostly cloudy. 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 likely before 11pm, then rain and snow likely between 11pm and 5am, then rain likely after 5am. 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.