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

Tonight: Widespread dense fog, mainly after 5am. Otherwise, mostly cloudy, with a low around 45. Northwest wind around 5 mph becoming calm in the evening.
Dense Fog


 Thursday

Thursday: Widespread dense fog, mainly before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 65. Light northwest wind.
Dense Fog
then Mostly
Sunny

 Thursday
Night
Thursday Night: Widespread fog, mainly after 4am. Otherwise, increasing clouds, with a low around 45. Calm wind.
Fog


 Friday

Friday: Rain likely, mainly after 4pm. Widespread fog, mainly before 10am. Otherwise, mostly cloudy, with a high near 61. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 60%.
Chance Rain
and Fog then
Rain Likely
and Patchy
Fog
 Friday
Night
Friday Night: Rain likely, mainly before 10pm. Patchy fog after 1am. Otherwise, cloudy, with a low around 52. Light south southwest wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
and Patchy
Fog

 Saturday

Saturday: Rain likely, mainly after 10am. Areas of fog before 1pm. Otherwise, cloudy, with a high near 62. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
and Areas Fog

 Saturday
Night
Saturday Night: Rain. Low around 54. Chance of precipitation is 80%.
Rain


 Sunday

Sunday: Rain. Cloudy, with a high near 59.
Rain


 Sunday
Night
Sunday Night: Rain. Cloudy, with a low around 52.
Rain
Lo 45 °F Hi 65 °F Lo 45 °F Hi 61 °F Lo 52 °F Hi 62 °F Lo 54 °F Hi 59 °F Lo 52 °F

 

Tonight
 
 Widespread dense fog, mainly after 5am. Otherwise, mostly cloudy, with a low around 45. Northwest wind around 5 mph becoming calm in the evening.
Thursday
 
 Widespread dense fog, mainly before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 65. Light northwest wind.
Thursday Night
 
 Widespread fog, mainly after 4am. Otherwise, increasing clouds, with a low around 45. Calm wind.
Friday
 
 Rain likely, mainly after 4pm. Widespread fog, mainly before 10am. Otherwise, mostly cloudy, with a high near 61. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 60%.
Friday Night
 
 Rain likely, mainly before 10pm. Patchy fog after 1am. Otherwise, cloudy, with a low around 52. Light south southwest wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
 
 Rain likely, mainly after 10am. Areas of fog before 1pm. Otherwise, cloudy, with a high near 62. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
 
 Rain. Low around 54. Chance of precipitation is 80%.
Sunday
 
 Rain. Cloudy, with a high near 59.
Sunday Night
 
 Rain. Cloudy, with a low around 52.
Monday
 
 Rain likely. Cloudy, with a high near 59.
Monday Night
 
 Rain likely. Cloudy, with a low around 48.
Tuesday
 
 Rain likely. Cloudy, with a high near 58.
Tuesday Night
 
 Rain. Cloudy, with a low around 48.
Wednesday
 
 Rain likely. Cloudy, with a high near 57.

 

Forecast from NOAA-NWS for San Martin CA.