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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 12:32 am EST Dec 12, 2025
Forecast Valid: 4am EST Dec 12, 2025-6pm EST Dec 18, 2025

Friday

W wind 15 to 18 kt increasing to 17 to 20 kt in the afternoon. Winds could gust as high as 30 kt. Sunny. Seas 1 ft or less.

Friday Night

W wind 10 to 15 kt, with gusts as high as 25 kt. Mostly clear. Seas 1 ft or less.

Saturday

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

Saturday Night

WSW wind 5 to 10 kt. A chance of snow after 3am. Seas 1 ft or less.

Sunday

Variable winds 5 kt or less. A chance of snow before 3pm. Seas 1 ft or less.

Sunday Night

NW wind 5 to 10 kt. Partly cloudy. Seas 1 ft or less.

Monday

WNW wind around 10 kt. 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. Mostly 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.