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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 5:17 am EDT Jul 9, 2025
Forecast Valid: 10am EDT Jul 9, 2025-6pm EDT Jul 15, 2025

Today

ENE wind 5 to 10 km/h. Isolated showers before 3pm, then isolated showers and thunderstorms after 5pm. Seas 1 m or less.

Tonight

Variable winds 5 km/h or less. Isolated showers and thunderstorms before 7pm, then isolated showers after 1am. Seas 1 m or less.

Thursday

ENE wind 5 to 10 km/h. Scattered showers, with thunderstorms also possible after 2pm. Seas 1 m or less.

Thursday Night

Variable winds 5 km/h or less. Scattered showers before 2am. Seas 1 m or less.

Friday

NE wind 5 to 10 km/h becoming ESE in the afternoon. Partly sunny. Seas 1 m or less.

Friday Night

Variable winds 5 km/h or less. Mostly cloudy. Seas 1 m or less.

Saturday

NE wind 5 to 10 km/h becoming SE in the afternoon. Mostly sunny. Seas 1 m or less.

Saturday Night

Variable winds 5 km/h or less. Mostly cloudy. Seas 1 m or less.

Sunday

SSE wind 5 to 10 km/h increasing to 10 to 15 km/h in the afternoon. Partly sunny. Seas 1 m 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.