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Gray/Portland, ME Local Forecast Office

8NM SE Portsmouth NH

Marine Point Forecast

[NOTICE]

Thursday
High: 51 °F
SW 20kt
3-4ft
Thursday Night
Low: 30 °F
WNW 20kt
3ft
Friday
High: 40 °F
⇑S 15kt
2-3ft
Friday Night
Low: 37 °F
S 20kt
4ft
Saturday
High: 43 °F
W 25kt
4ft
Saturday Night
Low: 32 °F
W 20kt⇓
2-3ft
Sunday
High: 41 °F
NW 10kt
1ft
Sunday Night
Low: 38 °F
⇑SE 25kt
4ft
Monday
High: 52 °F
S 30kt
6-7ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 2:21 am EDT Mar 12, 2026
Forecast Valid: 2am EDT Mar 12, 2026-6pm EDT Mar 18, 2026

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Detailed Forecast

Thursday

SSW wind 15 to 20 kt becoming WNW in the afternoon. Rain likely before 3pm, then a chance of rain and snow. Areas of dense fog before 10am. Seas 3 to 4 ft.

Thursday Night

WNW wind 15 to 20 kt, with gusts as high as 25 kt. A chance of rain and snow before 7pm, then a chance of snow between 7pm and 8pm. Seas around 3 ft.

Friday

W wind 10 to 13 kt becoming S 12 to 15 kt in the afternoon. Winds could gust as high as 25 kt. Increasing clouds. Seas 2 to 3 ft.

Friday Night

S wind around 20 kt, with gusts as high as 30 kt. A chance of snow between 9pm and 10pm, then a chance of rain after 10pm. Seas around 4 ft.

Saturday

W wind 20 to 25 kt, with gusts as high as 35 kt. Mostly sunny. Seas around 4 ft.

Saturday Night

W wind 17 to 20 kt decreasing to 15 to 18 kt after midnight. Winds could gust as high as 30 kt. Partly cloudy. Seas 2 to 3 ft.

Sunday

NW wind 5 to 10 kt becoming SE in the afternoon. Mostly cloudy. Seas around 1 ft.

Sunday Night

SE wind 15 to 20 kt increasing to 20 to 25 kt after midnight. Winds could gust as high as 30 kt. Rain likely. Seas 2 ft building to 4 ft.

Monday

S wind 25 to 30 kt, with gusts as high as 40 kt. Rain. Seas 6 to 7 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.