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Gray/Portland, ME Local Forecast Office

18NM NNE Portsmouth NH

Marine Point Forecast

[NOTICE]

Tonight
Low: 70 °F
Light Wind
< 1ft
Monday
High: 88 °F
S 10kt
< 1ft
Monday Night
Low: 69 °F
Light Wind
< 1ft
Tuesday
High: 83 °F
Light Wind
< 1ft
Tuesday Night
Low: 64 °F
Light Wind
< 1ft
Wednesday
High: 76 °F
Light Wind
< 1ft
Wednesday Night
Low: 62 °F
Light Wind
< 1ft
Thursday
High: 73 °F
Light Wind
< 1ft
Thursday Night
Low: 61 °F
Light Wind
< 1ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 1:57 pm EDT Jul 6, 2025
Forecast Valid: 7pm EDT Jul 6, 2025-6pm EDT Jul 13, 2025

View Nearby Observations

Detailed Forecast

Tonight

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

Monday

SW wind 5 to 10 kt becoming S in the afternoon. Mostly sunny. Seas 1 ft or less.

Monday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 1am. Seas 1 ft or less.

Tuesday

Variable winds 5 kt or less. Showers likely and possibly a thunderstorm, mainly after 2pm. Seas 1 ft or less.

Tuesday Night

Variable winds 5 kt or less. Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.

Wednesday

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

Wednesday Night

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

Thursday

Variable winds 5 kt or less. A chance of showers. Seas 1 ft or less.

Thursday Night

Variable winds 5 kt or less. A chance of showers. 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.