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Graves Harbor, AK Marine Weather Forecast

Station CSPA2 - Cape Spencer, AK

August 18, 2026 3:10 am AKDT
Location: 58.199N 136.64W
Wind Speed: 0.0 knots
Wind Gust: 0.0 knots
Atmospheric Pressure: 30.08 in (1018.5 mb)
Air Temperature: 52.7°F (11.5°C)
Dew Point: 52.7°F (11.5°C)


Overnight - 48°F
Aug 18, 2026
10 to 15 mph W
Slight Chance Light Rain
A slight chance of rain. Cloudy, with a low around 48. West wind 10 to 15 mph. Chance of precipitation is 20%.
Tuesday - 58°F
Aug 18, 2026
10 mph SW
Chance Light Rain
A chance of rain before 1pm. Cloudy, with a high near 58. Southwest wind around 10 mph. Chance of precipitation is 30%.
Tuesday Night - 52°F
Aug 18, 2026
5 to 10 mph S
Chance Light Rain
A chance of rain after 7pm. Cloudy, with a low around 52. South wind 5 to 10 mph. Chance of precipitation is 50%.
Wednesday - 55°F
Aug 19, 2026
5 mph E
Light Rain Likely
Rain likely. Cloudy, with a high near 55. East wind around 5 mph. Chance of precipitation is 60%.
Wednesday Night - 51°F
Aug 19, 2026
5 mph E
Rain
Rain. Cloudy, with a low around 51. East wind around 5 mph. Chance of precipitation is 100%.
Thursday - 55°F
Aug 20, 2026
5 mph E
Heavy Rain
Rain. Cloudy, with a high near 55. Chance of precipitation is 100%.
Thursday Night - 52°F
Aug 20, 2026
5 mph E
Heavy Rain
Rain. Cloudy, with a low around 52.
Friday - 58°F
Aug 21, 2026
5 mph S
Rain
Rain. Cloudy, with a high near 58.
Friday Night - 51°F
Aug 21, 2026
5 mph W
Light Rain Likely
Rain likely. Mostly cloudy, with a low around 51.
Saturday - 57°F
Aug 22, 2026
5 mph SW
Light Rain Likely
Rain likely. Cloudy, with a high near 57.
Saturday Night - 50°F
Aug 22, 2026
5 mph SE
Rain
Rain. Cloudy, with a low around 50.
Sunday - 56°F
Aug 23, 2026
5 to 10 mph E
Rain
Rain. Cloudy, with a high near 56.
Sunday Night - 50°F
Aug 23, 2026
5 to 10 mph E
Light Rain
Rain. Cloudy, with a low around 50.
Monday - 58°F
Aug 24, 2026
5 mph E
Light Rain Likely
Rain likely. Mostly cloudy, with a high near 58.

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