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Gray/Portland, ME Local Forecast Office

8NM SE Portsmouth NH

Marine Point Forecast

[NOTICE]

Monday
High: 69 °F
S 10kt
1-2ft
Monday Night
Low: 59 °F
NW 10kt
1ft
Tuesday
High: 66 °F
⇑S 10kt
1ft
Tuesday Night
Low: 58 °F
S 10kt⇓
1-2ft
Wednesday
High: 64 °F
⇑SSE 10kt
1ft
Wednesday Night
Low: 58 °F
S 10kt⇓
2ft
Thursday
High: 67 °F
⇑SSE 20kt
3ft
Thursday Night
Low: 62 °F
S 20kt⇓
3-4ft
Juneteenth
High: 71 °F
WSW 10kt
2ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 2:37 am EDT Jun 15, 2026
Forecast Valid: 3am EDT Jun 15, 2026-6pm EDT Jun 21, 2026

View Nearby Observations

Detailed Forecast

Monday

S wind 5 to 10 kt becoming NNW in the afternoon. Showers and thunderstorms likely before 9am, then isolated showers between 9am and 10am. Patchy fog between 7am and 8am. Seas 1 to 2 ft.

Monday Night

NW wind around 10 kt. Mostly clear. Seas around 1 ft.

Tuesday

WNW wind 5 to 8 kt becoming S 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

Variable winds less than 5 kt becoming SSE 5 to 10 kt in the afternoon. Mostly sunny. Seas around 1 ft.

Wednesday Night

S wind 7 to 10 kt decreasing to 5 to 8 kt after midnight. Mostly cloudy. Seas around 2 ft.

Thursday

SSE wind 10 to 15 kt increasing to 15 to 20 kt in the afternoon. Showers likely, mainly after 11am. Seas 1 ft building to 3 ft.

Thursday Night

S wind 15 to 20 kt becoming WSW 10 to 15 kt after midnight. A chance of showers. Seas 3 to 4 ft.

Juneteenth

WSW wind around 10 kt. Mostly sunny. 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.