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

Overnight: Patchy fog. Otherwise, mostly clear, with a low around 43. Light northwest wind.
Patchy Fog
 Monday

Monday: Patchy fog before 8am. Otherwise, sunny, with a high near 68. Calm wind becoming north northwest around 6 mph in the afternoon.
Patchy Fog
then Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 43. Calm wind.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 71. Light north wind.
Sunny
 Tuesday
Night
Tuesday Night: Clear, with a low around 44. Calm wind.
Clear
 Wednesday

Wednesday: Sunny, with a high near 72.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 46.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 71.
Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 48.
Mostly Cloudy
Lo 43 °F Hi 68 °F Lo 43 °F Hi 71 °F Lo 44 °F Hi 72 °F Lo 46 °F Hi 71 °F Lo 48 °F

 

Overnight
 
 Patchy fog. Otherwise, mostly clear, with a low around 43. Light northwest wind.
Monday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 68. Calm wind becoming north northwest around 6 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 43. Calm wind.
Tuesday
 
 Sunny, with a high near 71. Light north wind.
Tuesday Night
 
 Clear, with a low around 44. Calm wind.
Wednesday
 
 Sunny, with a high near 72.
Wednesday Night
 
 Mostly clear, with a low around 46.
Thursday
 
 Sunny, with a high near 71.
Thursday Night
 
 Mostly cloudy, with a low around 48.
Friday
 
 Mostly sunny, with a high near 68.
Friday Night
 
 Partly cloudy, with a low around 46.
Saturday
 
 Mostly sunny, with a high near 67.
Saturday Night
 
 Partly cloudy, with a low around 47.
Sunday
 
 A slight chance of rain. Mostly sunny, with a high near 67.

 

Forecast from NOAA-NWS for Sunnyvale CA.