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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 2:29 am EDT Aug 10, 2026
Forecast Valid: 4am EDT Aug 10, 2026-6pm EDT Aug 16, 2026

Monday

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

Monday Night

Variable winds 5 kt or less. A slight chance of showers between 9pm and 2am. Seas 1 ft or less.

Tuesday

WNW wind 5 to 10 kt. 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. 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, with thunderstorms also possible after 2pm. Seas 1 ft or less.

Thursday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 11pm. Seas 1 ft or less.

Friday

WNW wind 5 to 10 kt. Sunny. Seas 1 ft or less.

Winds and seas higher in and near tstms.

*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.