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Gray/Portland, ME Local Forecast Office

6NM SSE Portsmouth NH

Marine Point Forecast

[NOTICE]

Overnight
Low: 66 °F
SW 10kt
3ft
Sunday
High: 75 °F
WNW 10kt
1-2ft
Sunday Night
Low: 61 °F
Light Wind
1ft
Monday
High: 77 °F
Light Wind
1ft
Monday Night
Low: 63 °F
Light Wind
1-2ft
Tuesday
High: 74 °F
⇑SSE 15kt
1-2ft
Tuesday Night
Low: 65 °F
SSE 10kt
2ft
Wednesday
High: 76 °F
SSW 10kt
2-3ft
Wednesday Night
Low: 64 °F
WSW 10kt
3ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 6:15 pm EDT Jul 18, 2026
Forecast Valid: 11pm EDT Jul 18, 2026-6pm EDT Jul 25, 2026

View Nearby Observations

Detailed Forecast

Overnight

SW wind around 10 kt. A slight chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 1am. Areas of smoke before 1am. Seas around 3 ft.

Sunday

WNW wind around 10 kt. Sunny. Seas 1 to 2 ft.

Sunday Night

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

Monday

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

Monday Night

Variable winds 5 kt or less. Partly cloudy. Seas 1 to 2 ft.

Tuesday

SSE wind 5 to 10 kt increasing to 10 to 15 kt in the afternoon. Partly sunny. Seas 1 to 2 ft.

Tuesday Night

SSE wind around 10 kt. Showers and thunderstorms likely before 1am, then showers and possibly a thunderstorm between 1am and 2am, then showers after 2am. Seas around 2 ft.

Wednesday

SSW wind around 10 kt. Showers, with thunderstorms also possible after 2pm. Seas 2 to 3 ft.

Wednesday Night

WSW wind 5 to 10 kt. Showers likely and possibly a thunderstorm. Seas around 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.