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Gray/Portland, ME Local Forecast Office

8NM SE Portsmouth NH

Marine Point Forecast

[NOTICE]

This Afternoon
High: 71 °F
S 15kt
2ft
Tonight
Low: 61 °F
S 20kt
3ft
Monday
High: 69 °F
W 10kt
2ft
Monday Night
Low: 58 °F
WNW 10kt
1ft
Tuesday
High: 63 °F
⇑SSE 10kt
1ft
Tuesday Night
Low: 58 °F
S 10kt⇓
1-2ft
Wednesday
High: 64 °F
⇑SSE 10kt
1-2ft
Wednesday Night
Low: 59 °F
S 15kt⇓
2ft
Thursday
High: 68 °F
⇑SSE 20kt
3ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 8:32 am EDT Jun 14, 2026
Forecast Valid: 1pm EDT Jun 14, 2026-6pm EDT Jun 20, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

S wind around 15 kt, with gusts as high as 20 kt. Partly sunny. Seas around 2 ft.

Tonight

S wind 15 to 20 kt. Showers and thunderstorms likely before 4am, then rain and possibly a thunderstorm between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Seas around 3 ft.

Monday

W wind 5 to 10 kt becoming NW in the afternoon. A chance of showers before 8am. Seas around 2 ft.

Monday Night

WNW wind 5 to 10 kt. Mostly cloudy, then gradually becoming clear. Seas around 1 ft.

Tuesday

SW wind 5 to 8 kt becoming SSE 7 to 10 kt in the afternoon. Sunny. Seas around 1 ft.

Tuesday Night

S wind 7 to 10 kt becoming SW 5 to 8 kt after midnight. Mostly clear. Seas 1 to 2 ft.

Wednesday

SSE wind 5 to 8 kt increasing to 7 to 10 kt in the afternoon. Partly sunny. Seas 1 to 2 ft.

Wednesday Night

S wind 10 to 15 kt decreasing to 5 to 10 kt after midnight. A chance of showers. Seas around 2 ft.

Thursday

SSE wind 10 to 15 kt increasing to 15 to 20 kt in the afternoon. A chance of showers. Seas 1 ft building to 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.