National Weather Service Forecast for: Bethel Island CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 12:26 am PST Feb 2, 2026
 
Overnight

Overnight: Patchy fog between 4am and 5am. Otherwise, mostly clear, with a low around 42. West northwest wind around 6 mph.
Patchy Fog

 Monday

Monday: Sunny, with a high near 64. Northwest wind 5 to 7 mph.
Sunny

 Monday
Night
Monday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 40. Calm wind.
Partly Cloudy
then Patchy
Fog
 Tuesday

Tuesday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 63. Calm wind becoming north around 5 mph in the afternoon.
Areas Fog
then Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 41. Calm wind.
Mostly Clear
then Patchy
Fog
 Wednesday

Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 63.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 42.
Patchy Fog

 Thursday

Thursday: Areas of fog before 10am. Otherwise, partly sunny, with a high near 63.
Areas Fog
then Mostly
Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 46.
Mostly Cloudy
Lo 42 °F Hi 64 °F Lo 40 °F Hi 63 °F Lo 41 °F Hi 63 °F Lo 42 °F Hi 63 °F Lo 46 °F

 

Overnight
 
 Patchy fog between 4am and 5am. Otherwise, mostly clear, with a low around 42. West northwest wind around 6 mph.
Monday
 
 Sunny, with a high near 64. Northwest wind 5 to 7 mph.
Monday Night
 
 Patchy fog after 3am. Otherwise, partly cloudy, with a low around 40. Calm wind.
Tuesday
 
 Areas of fog before 10am. Otherwise, mostly sunny, with a high near 63. Calm wind becoming north around 5 mph in the afternoon.
Tuesday Night
 
 Patchy fog after 4am. Otherwise, mostly clear, with a low around 41. Calm wind.
Wednesday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 63.
Wednesday Night
 
 Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 42.
Thursday
 
 Areas of fog before 10am. Otherwise, partly sunny, with a high near 63.
Thursday Night
 
 Mostly cloudy, with a low around 46.
Friday
 
 Patchy fog before 8am. Otherwise, partly sunny, with a high near 64.
Friday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 46.
Saturday
 
 Areas of fog. Otherwise, mostly sunny, with a high near 64.
Saturday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 46.
Sunday
 
 A slight chance of rain. Areas of fog. Otherwise, partly sunny, with a high near 64.

 

Forecast from NOAA-NWS for Bethel Island CA.