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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 10:48 am EDT Oct 11, 2026
Forecast Valid: 11am EDT Oct 11, 2026-6pm EDT Oct 17, 2026

Today

S wind 5 to 10 kt. Mostly cloudy. Seas 1 ft or less.

Tonight

Variable winds 5 kt or less. Showers, mainly before 5am. Areas of fog after 2am. Seas 1 ft or less.

Columbus Day

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

Monday Night

Variable winds less than 5 kt becoming ENE 5 to 10 kt after midnight. Increasing clouds. Seas 1 ft or less.

Tuesday

ENE wind 5 to 10 kt becoming SE in the afternoon. Rain likely, mainly after 11am. Seas 1 ft or less.

Tuesday Night

S wind around 10 kt becoming SSW after midnight. Rain. Seas 1 ft or less.

Wednesday

WNW wind around 10 kt. Showers likely before 8am. Seas 1 ft or less.

Wednesday Night

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

Thursday

NW wind 5 to 10 kt. Sunny. 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.