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Gray/Portland, ME Local Forecast Office

8NM SE Portsmouth NH

Marine Point Forecast

[NOTICE]

Tonight
Low: 35 °F
WNW 15kt⇓
1-2ft
Sunday
High: 48 °F
⇑S 25kt
4ft
Sunday Night
Low: 38 °F
S 20kt
5ft
Monday
High: 40 °F
W 20kt
2-3ft
Monday Night
Low: 31 °F
NW 10kt⇓
1-2ft
Tuesday
High: 40 °F
Light Wind
1ft
Tuesday Night
Low: 33 °F
⇑N 20kt
2-3ft
Wednesday
High: 38 °F
NNW 20kt⇓
2-3ft
Wednesday Night
Low: 34 °F
WSW 15kt
2-3ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 3:31 pm EST Nov 29, 2025
Forecast Valid: 5pm EST Nov 29, 2025-6pm EST Dec 6, 2025

View Nearby Observations

Detailed Forecast

Tonight

WNW wind 10 to 15 kt becoming NW 5 to 8 kt after midnight. Increasing clouds. Seas 1 to 2 ft.

Sunday

S wind 10 to 15 kt increasing to 20 to 25 kt. Winds could gust as high as 30 kt. Rain, mainly after 3pm. Seas 1 ft building to 4 ft.

Sunday Night

S wind around 20 kt becoming W after midnight. Winds could gust as high as 30 kt. Rain, mainly before midnight. Seas 5 ft subsiding to 3 ft.

Monday

W wind 15 to 20 kt becoming NW in the afternoon. Winds could gust as high as 30 kt. Sunny. Seas 2 to 3 ft.

Monday Night

NW wind 7 to 10 kt becoming WNW 5 to 8 kt after midnight. Mostly cloudy. Seas 1 to 2 ft.

Tuesday

Variable winds 5 kt or less. A chance of snow before 10am, then rain and snow likely between 10am and 2pm, then rain after 2pm. Seas around 1 ft.

Tuesday Night

NNE wind 10 to 15 kt becoming N 15 to 20 kt after midnight. Winds could gust as high as 30 kt. Rain before 11pm, then rain and snow likely between 11pm and 4am, then a chance of snow after 4am. Seas 2 to 3 ft.

Wednesday

NNW wind 15 to 20 kt becoming WNW 10 to 15 kt in the afternoon. Winds could gust as high as 25 kt. Mostly sunny. Seas 2 to 3 ft.

Wednesday Night

WSW wind 10 to 15 kt, with gusts as high as 20 kt. Mostly cloudy. Seas 2 to 3 ft.

*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.