NWS Forecast for Bethel Island CA

National Weather Service Forecast for: Bethel Island CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA

Updated: 12:28 pm PST Dec 16, 2025

Tonight Chance Rain and Patchy Fog	Wednesday Chance Rain then Mostly Sunny	Wednesday Night Mostly Cloudy	Thursday Mostly Cloudy	Thursday Night Slight Chance Rain and Patchy Fog	Friday Chance Rain	Friday Night Rain Likely	Saturday Rain Likely	Saturday Night Rain
Lo 49 °F	Hi 64 °F	Lo 47 °F	Hi 59 °F	Lo 49 °F	Hi 59 °F	Lo 54 °F	Hi 56 °F	Lo 55 °F

Tonight	A 30 percent chance of rain after 10pm. Patchy fog before 7pm. Otherwise, cloudy, with a low around 49. Calm wind becoming south southeast 5 to 7 mph in the evening.
Wednesday	A 50 percent chance of rain before 10am. Mostly cloudy, then gradually becoming sunny, with a high near 64. South southeast wind 7 to 9 mph becoming west in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night	Mostly cloudy, with a low around 47. West wind 3 to 5 mph.
Thursday	Mostly cloudy, with a high near 59. Southwest wind 3 to 5 mph.
Thursday Night	A 20 percent chance of rain after 10pm. Patchy fog before 1am. Otherwise, mostly cloudy, with a low around 49. Light south wind.
Friday	A 40 percent chance of rain. Cloudy, with a high near 59. New precipitation amounts of less than a tenth of an inch possible.
Friday Night	Rain likely. Cloudy, with a low around 54. Chance of precipitation is 70%.
Saturday	Rain likely. Cloudy, with a high near 56.
Saturday Night	Rain. Cloudy, with a low around 55.
Sunday	Rain. Cloudy, with a high near 58.
Sunday Night	Rain likely. Cloudy, with a low around 54.
Monday	A chance of rain. Cloudy, with a high near 58.
Monday Night	A chance of rain. Cloudy, with a low around 50.
Tuesday	A chance of rain. Cloudy, with a high near 54.

Forecast from NOAA-NWS for Bethel Island CA.