National Weather Service Forecast for: Bethel Island CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 11:27 am PDT Oct 6, 2026
 
This
Afternoon
This Afternoon: Sunny and hot, with a high near 99. West northwest wind 6 to 9 mph.
Hot
 Tonight

Tonight: Clear, with a low around 62. West wind 5 to 7 mph becoming calm after midnight.
Clear
 Wednesday

Wednesday: Sunny and hot, with a high near 98. Light west northwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Hot
 Wednesday
Night
Wednesday Night: Clear, with a low around 60. West wind 5 to 8 mph, with gusts as high as 18 mph.
Clear
 Thursday

Thursday: Sunny and hot, with a high near 98. Northwest wind 3 to 8 mph.
Hot
 Thursday
Night
Thursday Night: Clear, with a low around 61.
Clear
 Friday

Friday: Sunny, with a high near 90.
Sunny
 Friday
Night
Friday Night: Clear, with a low around 57.
Clear
 Saturday

Saturday: Sunny, with a high near 77.
Sunny
Hi 99 °F Lo 62 °F Hi 98 °F Lo 60 °F Hi 98 °F Lo 61 °F Hi 90 °F Lo 57 °F Hi 77 °F

Heat Advisory
 

This Afternoon
 
 Sunny and hot, with a high near 99. West northwest wind 6 to 9 mph.
Tonight
 
 Clear, with a low around 62. West wind 5 to 7 mph becoming calm after midnight.
Wednesday
 
 Sunny and hot, with a high near 98. Light west northwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Wednesday Night
 
 Clear, with a low around 60. West wind 5 to 8 mph, with gusts as high as 18 mph.
Thursday
 
 Sunny and hot, with a high near 98. Northwest wind 3 to 8 mph.
Thursday Night
 
 Clear, with a low around 61.
Friday
 
 Sunny, with a high near 90.
Friday Night
 
 Clear, with a low around 57.
Saturday
 
 Sunny, with a high near 77.
Saturday Night
 
 Mostly clear, with a low around 51.
Sunday
 
 Sunny, with a high near 74.
Sunday Night
 
 Mostly clear, with a low around 52.
Columbus Day
 
 Sunny, with a high near 75.

 

Forecast from NOAA-NWS for Bethel Island CA.