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Great Diamond Island, ME Marine Weather Forecast

Station CASM1 - 8418150 - Portland, ME

April 25, 2025 7:00 pm EDT
Location: 43.656N 70.246W
Wind Direction: SSW (210°)
Wind Speed: 4.1 knots
Wind Gust: 5.1 knots
Atmospheric Pressure: 30.14 in (1020.6 mb)
Pressure Tendency: -0.02 in (-0.7 mb)
Air Temperature: 55.9°F (13.3°C)
Water Temperature: 44.1°F (6.7°C)


Tonight - 46°F
Apr 25, 2025
5 mph E
Slight Chance Light Rain then Areas Of Fog
A slight chance of rain before midnight, then patchy fog between 1am and 4am, then areas of fog and a chance of rain. Cloudy, with a low around 46. East wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
Saturday - 53°F
Apr 26, 2025
10 to 15 mph S
Rain
Areas of fog and a chance of rain before 7am, then rain and areas of fog. Cloudy, with a high near 53. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Saturday Night - 47°F
Apr 26, 2025
5 to 10 mph SW
Areas Of Fog
Areas of fog and a chance of rain showers before 5am. Mostly cloudy, with a low around 47. Southwest wind 5 to 10 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Sunday - 51°F
Apr 27, 2025
10 to 15 mph W
Rain Showers Likely
Rain showers likely after 8am. Mostly cloudy, with a high near 51. West wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Sunday Night - 45°F
Apr 27, 2025
10 to 15 mph NW
Rain Showers Likely
Rain showers likely before 2am. Mostly cloudy, with a low around 45. Northwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Monday - 62°F
Apr 28, 2025
10 mph NW
Sunny
Sunny, with a high near 62.
Monday Night - 45°F
Apr 28, 2025
5 to 10 mph NW
Mostly Clear
Mostly clear, with a low around 45.
Tuesday - 61°F
Apr 29, 2025
5 to 15 mph SW
Mostly Sunny
Mostly sunny, with a high near 61.
Tuesday Night - 55°F
Apr 29, 2025
10 to 15 mph SW
Slight Chance Rain Showers
A slight chance of rain showers after 8pm. Mostly cloudy, with a low around 55.
Wednesday - 65°F
Apr 30, 2025
10 to 15 mph W
Slight Chance Rain Showers
A slight chance of rain showers before 2pm. Mostly sunny, with a high near 65.
Wednesday Night - 43°F
Apr 30, 2025
10 mph NW
Mostly Clear
Mostly clear, with a low around 43.
Thursday - 53°F
May 01, 2025
5 to 10 mph N
Mostly Sunny
Mostly sunny, with a high near 53.
Thursday Night - 44°F
May 01, 2025
5 to 10 mph S
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 2am. Mostly cloudy, with a low around 44.
Friday - 50°F
May 02, 2025
5 to 10 mph S
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a high near 50. Chance of precipitation is 40%.

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