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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 6:28 am EDT Oct 17, 2025
Forecast Valid: 7am EDT Oct 17, 2025-6pm EDT Oct 23, 2025

Today

NW wind 5 to 10 kt becoming N in the morning. Sunny. Seas 1 ft or less.

Tonight

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

Saturday

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

Saturday Night

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

Sunday

SSW wind 5 to 10 kt becoming SSE in the afternoon. Mostly sunny. Seas 1 ft or less.

Sunday Night

SSE wind around 10 kt, with gusts as high as 20 kt. Showers likely, mainly after 4am. Seas 1 ft or less.

Monday

SSE wind 10 to 15 kt, with gusts as high as 25 kt. Rain likely, mainly before 4pm. Seas 1 ft or less.

Monday Night

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

Tuesday

Variable winds 5 kt or less. A chance of showers. 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.