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Gray/Portland, ME Local Forecast Office

6NM SSE Portsmouth NH

Marine Point Forecast

[NOTICE]

Tonight
Low: 62 °F
Light Wind
1ft
Saturday
High: 82 °F
⇑SSW 15kt
1-2ft
Saturday Night
Low: 66 °F
SSW 15kt
3ft
Sunday
High: 77 °F
WNW 10kt
2ft
Sunday Night
Low: 61 °F
Light Wind
1ft
Monday
High: 77 °F
Light Wind
1ft
Monday Night
Low: 64 °F
SSW 10kt
1-2ft
Tuesday
High: 76 °F
⇑SSE 10kt
1-2ft
Tuesday Night
Low: 66 °F
S 10kt
2ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 3:38 pm EDT Jul 17, 2026
Forecast Valid: 5pm EDT Jul 17, 2026-6pm EDT Jul 24, 2026

View Nearby Observations

Detailed Forecast

Tonight

Variable winds 5 kt or less. Increasing clouds. Seas around 1 ft.

Saturday

SSW wind 5 to 8 kt becoming SSW 10 to 15 kt in the afternoon. Winds could gust as high as 20 kt. A chance of showers, with thunderstorms also possible after 5pm. Areas of smoke after noon. Seas 1 to 2 ft.

Saturday Night

SSW wind 10 to 15 kt becoming WSW after midnight. Winds could gust as high as 25 kt. Showers and thunderstorms likely before midnight, then a chance of showers between midnight and 2am. Patchy smoke before 1am. Seas around 3 ft.

Sunday

WNW wind around 10 kt. Partly sunny through mid morning, then becoming sunny. Seas around 2 ft.

Sunday Night

Variable winds 5 kt or less. Mostly clear. Seas around 1 ft.

Monday

Variable winds 5 kt or less. Sunny. Seas around 1 ft.

Monday Night

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

Tuesday

S wind 5 to 8 kt becoming SSE 7 to 10 kt in the afternoon. A chance of showers. Seas 1 to 2 ft.

Tuesday Night

S wind around 10 kt. Showers likely and possibly a thunderstorm, then showers after 2am. Seas around 2 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.