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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 1:39 am EDT Jul 13, 2025
Forecast Valid: 3am EDT Jul 13, 2025-6pm EDT Jul 19, 2025

Sunday

SSE wind 5 to 10 kt. Areas of dense fog before 9am. Seas 1 ft or less.

Sunday Night

Variable winds 5 kt or less. Patchy fog after 10pm. Seas 1 ft or less.

Monday

Variable winds 5 kt or less. A chance of showers and thunderstorms after 2pm. Areas of fog before 8am. 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.

Wednesday

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

Wednesday Night

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

Thursday

Variable winds 5 kt or less. A chance of showers and thunderstorms after 2pm. 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.