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Gray/Portland, ME Local Forecast Office

8NM SE Portsmouth NH

Marine Point Forecast

[NOTICE]

Late Afternoon
High: 47 °F
NW 20kt
2ft
Tonight
Low: 39 °F
W 15kt⇓
2ft
Monday
High: 45 °F
W 10kt
1-2ft
Monday Night
Low: 36 °F
⇑N 15kt
1-2ft
Tuesday
High: 41 °F
N 10kt
1ft
Tuesday Night
Low: 39 °F
S 15kt
2ft
Wednesday
High: 45 °F
S 10kt
2ft
Wednesday Night
Low: 41 °F
S 10kt
2ft
Thursday
High: 49 °F
WNW 10kt
1-2ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 2:51 pm EDT Apr 19, 2026
Forecast Valid: 4pm EDT Apr 19, 2026-6pm EDT Apr 26, 2026

View Nearby Observations

Detailed Forecast

Late Afternoon

NW wind 15 to 20 kt. Rain likely and possibly a thunderstorm. Seas around 2 ft.

Tonight

W wind 12 to 15 kt decreasing to 10 to 13 kt after midnight. Winds could gust as high as 25 kt. A chance of rain, mainly before 8pm. Seas around 2 ft.

Monday

W wind 5 to 10 kt becoming WNW in the afternoon. A chance of showers, mainly after 3pm. Seas 1 to 2 ft.

Monday Night

N wind 10 to 13 kt increasing to 12 to 15 kt after midnight. Winds could gust as high as 20 kt. Mostly cloudy. Seas 1 to 2 ft.

Tuesday

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

Tuesday Night

SSE wind 10 to 15 kt becoming SSW after midnight. Partly cloudy. Seas around 2 ft.

Wednesday

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

Wednesday Night

S wind around 10 kt becoming W after midnight. Mostly cloudy. Seas around 2 ft.

Thursday

WNW wind 5 to 10 kt becoming ENE in the afternoon. Partly sunny. Seas 1 to 2 ft.

Winds and seas higher in and near tstms.

*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.