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Gray/Portland, ME Local Forecast Office

18NM NNE Portsmouth NH

Marine Point Forecast

[NOTICE]

Thursday
High: 85 °F
⇑S 10kt
< 1ft
Thursday Night
Low: 66 °F
W 10kt
< 1ft
Friday
High: 81 °F
NW 10kt
< 1ft
Friday Night
Low: 58 °F
Light Wind
< 1ft
Saturday
High: 81 °F
Light Wind
< 1ft
Saturday Night
Low: 63 °F
Light Wind
< 1ft
Sunday
High: 79 °F
Light Wind
< 1ft
Sunday Night
Low: 59 °F
Light Wind
< 1ft
Monday
High: 77 °F
Light Wind
< 1ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 1:41 am EDT Jul 17, 2025
Forecast Valid: 2am EDT Jul 17, 2025-6pm EDT Jul 23, 2025

View Nearby Observations

Detailed Forecast

Thursday

S wind 5 to 8 kt increasing to 7 to 10 kt in the afternoon. Winds could gust as high as 20 kt. Showers and thunderstorms likely, mainly before 4pm. Patchy fog before 9am. Seas 1 ft or less.

Thursday Night

SSW wind 5 to 10 kt becoming W after midnight. Mostly cloudy, then gradually becoming clear. Seas 1 ft or less.

Friday

NW wind 5 to 10 kt, with gusts as high as 20 kt. Sunny. Seas 1 ft or less.

Friday Night

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

Saturday

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

Saturday Night

Variable winds 5 kt or less. Showers likely, mainly after 2am. Seas 1 ft or less.

Sunday

Variable winds 5 kt or less. Showers likely, mainly before 8am. Seas 1 ft or less.

Sunday Night

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

Monday

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

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.