National Weather Service Forecast for: Sunnyvale CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 11:55 pm PST Dec 22, 2025
 
Overnight

Overnight: A 20 percent chance of rain. Patchy fog. Otherwise, cloudy, with a low around 53. Calm wind becoming east southeast around 6 mph.
Slight Chance
Rain and
Patchy Fog
 Tuesday

Tuesday: Rain likely, mainly after 4pm. Patchy fog before 9am. Otherwise, cloudy, with a high near 61. South southeast wind 8 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Chance Rain
and Patchy
Fog then Rain
Likely
 Tuesday
Night
Tuesday Night: Rain. Low around 52. Breezy, with an east southeast wind 18 to 25 mph becoming south after midnight. Winds could gust as high as 55 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Rain and
Breezy

 Wednesday

Wednesday: Rain, mainly before 4pm, then showers and possibly a thunderstorm after 4pm. Some of the storms could be severe. Patchy fog before 10am. High near 60. Light and variable wind becoming south southeast 8 to 13 mph in the morning. Winds could gust as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Rain and
Patchy Fog
then Severe
T-Storms
 Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm before 7pm, then rain after 7pm. Some of the storms could be severe. Low around 51. South southeast wind 18 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Severe
T-Storms
then Rain
 Christmas
Day
Christmas Day: Showers and possibly a thunderstorm. High near 55. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Showers

 Thursday
Night
Thursday Night: Showers and possibly a thunderstorm before 1am, then rain after 1am. Low around 47. Chance of precipitation is 100%.
Showers

 Friday

Friday: Rain. Cloudy, with a high near 54.
Rain

 Friday
Night
Friday Night: Rain likely, mainly before 10pm. Patchy fog before 9pm, then patchy fog after 4am. Otherwise, mostly cloudy, with a low around 44.
Rain Likely
and Patchy
Fog
Lo 53 °F Hi 61 °F Lo 52 °F Hi 60 °F Lo 51 °F Hi 55 °F Lo 47 °F Hi 54 °F Lo 44 °F

Flood Watch
Wind Advisory
 

Overnight
 
 A 20 percent chance of rain. Patchy fog. Otherwise, cloudy, with a low around 53. Calm wind becoming east southeast around 6 mph.
Tuesday
 
 Rain likely, mainly after 4pm. Patchy fog before 9am. Otherwise, cloudy, with a high near 61. South southeast wind 8 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
 
 Rain. Low around 52. Breezy, with an east southeast wind 18 to 25 mph becoming south after midnight. Winds could gust as high as 55 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday
 
 Rain, mainly before 4pm, then showers and possibly a thunderstorm after 4pm. Some of the storms could be severe. Patchy fog before 10am. High near 60. Light and variable wind becoming south southeast 8 to 13 mph in the morning. Winds could gust as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
 Showers and possibly a thunderstorm before 7pm, then rain after 7pm. Some of the storms could be severe. Low around 51. South southeast wind 18 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Christmas Day
 
 Showers and possibly a thunderstorm. High near 55. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
 
 Showers and possibly a thunderstorm before 1am, then rain after 1am. Low around 47. Chance of precipitation is 100%.
Friday
 
 Rain. Cloudy, with a high near 54.
Friday Night
 
 Rain likely, mainly before 10pm. Patchy fog before 9pm, then patchy fog after 4am. Otherwise, mostly cloudy, with a low around 44.
Saturday
 
 A slight chance of rain before 10am. Areas of fog before 11am. Otherwise, mostly sunny, with a high near 55.
Saturday Night
 
 Patchy fog. Otherwise, mostly clear, with a low around 38.
Sunday
 
 Patchy fog. Otherwise, sunny, with a high near 55.
Sunday Night
 
 Mostly clear, with a low around 40.
Monday
 
 Mostly sunny, with a high near 56.

 

Forecast from NOAA-NWS for Sunnyvale CA.