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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 8:05 pm EDT Jul 11, 2025
Forecast Valid: 9pm EDT Jul 11, 2025-6pm EDT Jul 18, 2025

Tonight

Variable winds 5 kt or less. Patchy fog after midnight. Seas 1 ft or less.

Saturday

Variable winds 5 kt or less. A slight chance of showers and thunderstorms between 2pm and 3pm. Areas of fog before 11am. Seas 1 ft or less.

Saturday Night

Variable winds 5 kt or less. Patchy fog between 7pm and 8pm. Seas 1 ft or less.

Sunday

Variable winds 5 kt or less. Partly sunny. Seas 1 ft or less.

Sunday Night

Variable winds 5 kt or less. Patchy fog after 1am. Seas 1 ft or less.

Monday

Variable winds 5 kt or less. A chance of showers and thunderstorms after 2pm. Patchy fog before 7am. Seas 1 ft or less.

Monday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms before 8pm. Seas 1 ft or less.

Tuesday

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

Tuesday Night

Variable winds 5 kt or less. Mostly clear. 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.