National Weather Service Forecast for: Monte Rio 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 between 7pm and 5am. Otherwise, increasing clouds, with a low around 45. Light west wind.
Dense Fog

 Thursday

Thursday: A 20 percent chance of rain after 10am. Widespread dense fog before 1pm. Otherwise, mostly cloudy, with a high near 57. Light south wind.
Slight Chance
Rain and
Dense Fog
 Thursday
Night
Thursday Night: Rain. Areas of fog. Low around 51. Calm wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Rain and
Areas Fog

 Friday

Friday: Rain. Patchy fog before 7am. High near 56. South wind 5 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Rain and
Patchy Fog

 Friday
Night
Friday Night: Rain, mainly before 10pm. Patchy fog after 1am. Low around 50. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain then
Chance Rain
and Patchy
Fog
 Saturday

Saturday: Rain likely, then showers and possibly a thunderstorm after 4pm. Patchy dense fog before 10am. High near 55. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and
Patchy Dense
Fog
 Saturday
Night
Saturday Night: Showers and possibly a thunderstorm before 7pm, then rain between 7pm and 10pm, then showers and possibly a thunderstorm after 10pm. Some of the storms could produce heavy rainfall. Low around 51. Chance of precipitation is 90%.
Heavy Rain

 Sunday

Sunday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Cloudy, with a high near 57.
Heavy Rain

 Sunday
Night
Sunday Night: Rain. Cloudy, with a low around 48.
Rain
Lo 45 °F Hi 57 °F Lo 51 °F Hi 56 °F Lo 50 °F Hi 55 °F Lo 51 °F Hi 57 °F Lo 48 °F

 

Tonight
 
 Widespread dense fog, mainly between 7pm and 5am. Otherwise, increasing clouds, with a low around 45. Light west wind.
Thursday
 
 A 20 percent chance of rain after 10am. Widespread dense fog before 1pm. Otherwise, mostly cloudy, with a high near 57. Light south wind.
Thursday Night
 
 Rain. Areas of fog. Low around 51. Calm wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
 
 Rain. Patchy fog before 7am. High near 56. South wind 5 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Friday Night
 
 Rain, mainly before 10pm. Patchy fog after 1am. Low around 50. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
 
 Rain likely, then showers and possibly a thunderstorm after 4pm. Patchy dense fog before 10am. High near 55. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday Night
 
 Showers and possibly a thunderstorm before 7pm, then rain between 7pm and 10pm, then showers and possibly a thunderstorm after 10pm. Some of the storms could produce heavy rainfall. Low around 51. Chance of precipitation is 90%.
Sunday
 
 Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Cloudy, with a high near 57.
Sunday Night
 
 Rain. Cloudy, with a low around 48.
Monday
 
 Rain likely. Mostly cloudy, with a high near 56.
Monday Night
 
 Rain likely. Mostly cloudy, with a low around 45.
Tuesday
 
 Rain likely. Mostly cloudy, with a high near 52.
Tuesday Night
 
 Rain. Cloudy, with a low around 46.
Wednesday
 
 Rain likely. Mostly cloudy, with a high near 54.

 

Forecast from NOAA-NWS for Monte Rio CA.