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Gray/Portland, ME Local Forecast Office

10NM S Portsmouth NH

Marine Point Forecast

[NOTICE]

Tonight
Low: 19 °C
SW 15km/h
< 1m
Sunday
High: 30 °C
SW 20km/h
1m
Sunday Night
Low: 22 °C
SW 20km/h
1m
Monday
High: 30 °C
SSW 20km/h
1m
Monday Night
Low: 21 °C
SSW 15km/h
1m
Tuesday
High: 26 °C
ESE 15km/h
1m
Tuesday Night
Low: 19 °C
SE 10km/h
< 1m
Wednesday
High: 23 °C
NNE 10km/h
< 1m
Wednesday Night
Low: 18 °C
ENE 10km/h
< 1m

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 1:41 pm EDT Jul 5, 2025
Forecast Valid: 6pm EDT Jul 5, 2025-6pm EDT Jul 12, 2025

View Nearby Observations

Detailed Forecast

Tonight

S wind 10 to 15 km/h becoming SW after midnight. Mostly cloudy. Seas 1 m or less.

Sunday

SW wind 15 to 20 km/h. Mostly sunny. Seas around 1 m.

Sunday Night

SW wind around 20 km/h. Mostly clear. Seas around 1 m.

Monday

SSW wind 15 to 20 km/h. Mostly sunny. Seas around 1 m.

Monday Night

SSW wind around 15 km/h. A chance of showers after 8pm. Seas around 1 m.

Tuesday

SW wind 10 to 15 km/h becoming ESE in the afternoon. A chance of showers, then showers and possibly a thunderstorm after 2pm. Seas around 1 m.

Tuesday Night

SE wind 5 to 10 km/h becoming N in the evening. Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Seas 1 m or less.

Wednesday

NNE wind around 10 km/h becoming ENE in the afternoon. A chance of showers. Seas 1 m or less.

Wednesday Night

ENE wind 5 to 10 km/h. A chance of showers. 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.