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18NM NNE Portsmouth NH

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 6:02 am EST Mar 1, 2026
Forecast Valid: 1pm EST Mar 1, 2026-6pm EST Mar 7, 2026

This Afternoon

NW wind around 10 kt. Mostly cloudy, then gradually becoming sunny. Seas 1 ft or less.

Tonight

NNW wind 5 to 10 kt. Mostly clear. Seas 1 ft or less.

Monday

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

Monday Night

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

Tuesday

SSW wind 5 to 10 kt. A chance of snow after 2pm, mixing with rain after 3pm. Seas 1 ft or less.

Tuesday Night

Variable winds 5 kt or less. Rain and snow before 11pm, then rain between 11pm and 1am, then snow after 1am. Seas 1 ft or less.

Wednesday

Variable winds 5 kt or less. Snow likely before 7am. Seas 1 ft or less.

Wednesday Night

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

Thursday

Variable winds 5 kt or less. Partly 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.