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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 5:57 pm EST Jan 7, 2026
Forecast Valid: 6pm EST Jan 7, 2026-6pm EST Jan 14, 2026

Tonight

Variable winds 5 kt or less. Patchy freezing fog between 7pm and 4am. Seas 1 ft or less.

Thursday

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

Thursday Night

Variable winds 5 kt or less. Patchy freezing fog after 9pm. Seas 1 ft or less.

Friday

SSW wind 5 to 8 kt increasing to 7 to 10 kt in the afternoon. A chance of showers after 2pm. Patchy freezing fog before 10am. Seas 1 ft or less.

Friday Night

Variable winds 5 kt or less. Showers likely before 1am. Seas 1 ft or less.

Saturday

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

Saturday Night

Variable winds 5 kt or less. Rain, mainly before 4am. Seas 1 ft or less.

Sunday

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

Sunday Night

W wind 5 to 10 kt. Mostly cloudy. 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.