National Weather Service Forecast for: Walnut Creek CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:24 pm PST Dec 17, 2025
 
Tonight

Tonight: Patchy dense fog. Otherwise, increasing clouds, with a low around 46. Calm wind.
Patchy Dense
Fog
 Thursday

Thursday: Areas of dense fog before 11am. Otherwise, partly sunny, with a high near 61. Light and variable wind.
Areas Dense
Fog then
Partly Sunny
 Thursday
Night
Thursday Night: A 30 percent chance of rain, mainly after 4am. Patchy fog between 10pm and 1am. Otherwise, cloudy, with a low around 49. Light south wind.
Chance Rain
and Patchy
Fog
 Friday

Friday: Rain, mainly after 10am. High near 61. South wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Rain

 Friday
Night
Friday Night: Rain, mainly before 4am. Low around 53. South southwest wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain

 Saturday

Saturday: Rain, mainly after 10am. High near 58. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain

 Saturday
Night
Saturday Night: Rain before 10pm, then showers and possibly a thunderstorm after 10pm. Low around 54. Chance of precipitation is 90%.
Showers

 Sunday

Sunday: Showers and possibly a thunderstorm. Cloudy, with a high near 58.
Showers

 Sunday
Night
Sunday Night: Rain. Cloudy, with a low around 53.
Rain
Lo 46 °F Hi 61 °F Lo 49 °F Hi 61 °F Lo 53 °F Hi 58 °F Lo 54 °F Hi 58 °F Lo 53 °F

Dense Fog Advisory
 

Tonight
 
 Patchy dense fog. Otherwise, increasing clouds, with a low around 46. Calm wind.
Thursday
 
 Areas of dense fog before 11am. Otherwise, partly sunny, with a high near 61. Light and variable wind.
Thursday Night
 
 A 30 percent chance of rain, mainly after 4am. Patchy fog between 10pm and 1am. Otherwise, cloudy, with a low around 49. Light south wind.
Friday
 
 Rain, mainly after 10am. High near 61. South wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
 
 Rain, mainly before 4am. Low around 53. South southwest wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
 
 Rain, mainly after 10am. High near 58. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
 
 Rain before 10pm, then showers and possibly a thunderstorm after 10pm. Low around 54. Chance of precipitation is 90%.
Sunday
 
 Showers and possibly a thunderstorm. Cloudy, with a high near 58.
Sunday Night
 
 Rain. Cloudy, with a low around 53.
Monday
 
 Rain likely. Cloudy, with a high near 57.
Monday Night
 
 Rain likely. Cloudy, with a low around 48.
Tuesday
 
 Rain likely. Cloudy, with a high near 54.
Tuesday Night
 
 Rain. Cloudy, with a low around 49.
Wednesday
 
 Rain likely. Cloudy, with a high near 55.

 

Forecast from NOAA-NWS for Walnut Creek CA.