National Weather Service Forecast for: Grass Valley CA
Issued by: National Weather Service Sacramento, CA
Updated: 1:21 pm PST Dec 16, 2025
 
Tonight

Tonight: Showers likely, then showers and possibly a thunderstorm after 1am. Widespread fog, mainly between 7pm and 11pm. Low around 45. Calm wind becoming south around 6 mph after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Showers and
Fog

 Wednesday

Wednesday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers after 4pm. Cloudy, with a high near 55. South wind 3 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely then
Chance
Showers
 Wednesday
Night
Wednesday Night: A 30 percent chance of showers, mainly before 10pm. Partly cloudy, with a low around 41. Calm wind.
Chance
Showers

 Thursday

Thursday: A 20 percent chance of showers. Mostly sunny, with a high near 59. Light and variable wind.
Slight Chance
Showers

 Thursday
Night
Thursday Night: A 40 percent chance of showers, mainly after 10pm. Mostly cloudy, with a low around 45. Calm wind.
Chance
Showers

 Friday

Friday: Showers likely, mainly after 10am. Mostly cloudy, with a high near 54. Chance of precipitation is 70%.
Showers
Likely

 Friday
Night
Friday Night: Showers. Low around 48. Chance of precipitation is 90%.
Showers

 Saturday

Saturday: Showers. Cloudy, with a high near 54.
Showers

 Saturday
Night
Saturday Night: Showers, with thunderstorms also possible after 10pm. Cloudy, with a low around 49.
Showers
Lo 45 °F Hi 55 °F Lo 41 °F Hi 59 °F Lo 45 °F Hi 54 °F Lo 48 °F Hi 54 °F Lo 49 °F

 

Tonight
 
 Showers likely, then showers and possibly a thunderstorm after 1am. Widespread fog, mainly between 7pm and 11pm. Low around 45. Calm wind becoming south around 6 mph after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
 
 Showers likely and possibly a thunderstorm before 1pm, then a chance of showers after 4pm. Cloudy, with a high near 55. South wind 3 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
 A 30 percent chance of showers, mainly before 10pm. Partly cloudy, with a low around 41. Calm wind.
Thursday
 
 A 20 percent chance of showers. Mostly sunny, with a high near 59. Light and variable wind.
Thursday Night
 
 A 40 percent chance of showers, mainly after 10pm. Mostly cloudy, with a low around 45. Calm wind.
Friday
 
 Showers likely, mainly after 10am. Mostly cloudy, with a high near 54. Chance of precipitation is 70%.
Friday Night
 
 Showers. Low around 48. Chance of precipitation is 90%.
Saturday
 
 Showers. Cloudy, with a high near 54.
Saturday Night
 
 Showers, with thunderstorms also possible after 10pm. Cloudy, with a low around 49.
Sunday
 
 Showers. The rain could be heavy at times. Cloudy, with a high near 54.
Sunday Night
 
 Showers. Mostly cloudy, with a low around 48.
Monday
 
 Showers likely. Mostly cloudy, with a high near 55.
Monday Night
 
 Showers likely. Mostly cloudy, with a low around 46.
Tuesday
 
 Showers likely. Mostly cloudy, with a high near 55.

 

Forecast from NOAA-NWS for Grass Valley CA.