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Gray/Portland, ME Local Forecast Office

6NM SSE Portsmouth NH

Marine Point Forecast

[NOTICE]

Tonight
Low: 22 °F
W 10kt
2ft
Tuesday
High: 33 °F
W 10kt
1-2ft
Tuesday Night
Low: 28 °F
SW 15kt
1-2ft
Wednesday
High: 42 °F
SW 15kt
2-3ft
Wednesday Night
Low: 31 °F
W 10kt
1-2ft
Thursday
High: 48 °F
⇑S 10kt
1-2ft
Thursday Night
Low: 42 °F
⇑S 20kt
5ft
Friday
High: 53 °F
S 20kt
5ft
Friday Night
Low: 24 °F
W 20kt
5-6ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 6:21 pm EST Dec 15, 2025
Forecast Valid: 7pm EST Dec 15, 2025-6pm EST Dec 22, 2025

View Nearby Observations

Detailed Forecast

Tonight

W wind around 10 kt. Mostly cloudy. Seas around 2 ft.

Tuesday

W wind 5 to 10 kt becoming SW in the afternoon. Sunny. Seas 1 to 2 ft.

Tuesday Night

SW wind 10 to 15 kt. Mostly cloudy. Seas 1 to 2 ft.

Wednesday

SW wind 10 to 15 kt. Partly sunny. Seas 2 to 3 ft.

Wednesday Night

W wind 5 to 10 kt. Partly cloudy. Seas 1 to 2 ft.

Thursday

W wind 5 to 8 kt becoming S 7 to 10 kt in the afternoon. Mostly sunny. Seas 1 to 2 ft.

Thursday Night

S wind 15 to 18 kt increasing to 17 to 20 kt after midnight. Winds could gust as high as 30 kt. Rain likely, mainly after 2am. Seas 3 ft building to 5 ft.

Friday

S wind around 20 kt becoming WSW in the afternoon. Winds could gust as high as 30 kt. Rain. Seas around 5 ft.

Friday Night

W wind 15 to 20 kt, with gusts as high as 25 kt. Partly cloudy. Seas 5 to 6 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.