National Weather Service Forecast for: Walnut Creek CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:40 am PST Dec 5, 2025
 
Overnight

Overnight: Patchy fog. Patchy frost. Otherwise, partly cloudy, with a low around 36. Light north wind.
Patchy Frost
and Patchy
Fog
 Friday

Friday: Areas of frost before 7am. Otherwise, sunny, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.
Areas Frost
then Sunny
 Friday
Night
Friday Night: Partly cloudy, with a low around 41. South southwest wind 5 to 7 mph becoming calm.
Partly Cloudy

 Saturday

Saturday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 62. Calm wind becoming north around 5 mph in the afternoon.
Patchy Fog
then Sunny
 Saturday
Night
Saturday Night: Patchy fog after 1am. Otherwise, mostly clear, with a low around 44. Light and variable wind.
Mostly Clear
then Patchy
Fog
 Sunday

Sunday: Mostly sunny, with a high near 64.
Mostly Sunny

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 44.
Partly Cloudy

 Monday

Monday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 64.
Patchy Fog
then Sunny
 Monday
Night
Monday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 45.
Mostly Clear
then Patchy
Fog
Lo 36 °F Hi 61 °F Lo 41 °F Hi 62 °F Lo 44 °F Hi 64 °F Lo 44 °F Hi 64 °F Lo 45 °F

Cold Weather Advisory
 

Overnight
 
 Patchy fog. Patchy frost. Otherwise, partly cloudy, with a low around 36. Light north wind.
Friday
 
 Areas of frost before 7am. Otherwise, sunny, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.
Friday Night
 
 Partly cloudy, with a low around 41. South southwest wind 5 to 7 mph becoming calm.
Saturday
 
 Patchy fog before 8am. Otherwise, mostly sunny, with a high near 62. Calm wind becoming north around 5 mph in the afternoon.
Saturday Night
 
 Patchy fog after 1am. Otherwise, mostly clear, with a low around 44. Light and variable wind.
Sunday
 
 Mostly sunny, with a high near 64.
Sunday Night
 
 Partly cloudy, with a low around 44.
Monday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 64.
Monday Night
 
 Patchy fog after 5am. Otherwise, partly cloudy, with a low around 45.
Tuesday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 64.
Tuesday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 47.
Wednesday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 66.
Wednesday Night
 
 Patchy fog. Otherwise, mostly clear, with a low around 47.
Thursday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 66.

 

Forecast from NOAA-NWS for Walnut Creek CA.