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Weather Forecast for Fontana

Now
Current Weather Conditions
61° F

Wind: 4.61 mph
Humidity: 51%
Clouds: 100%
Pressure: 1018 hPa
Sunrise: 10:55 AM ET
Sunset: 8:50 PM ET
Tomorrow
Tomorrow's Weather Conditions
Heavy Rain

Heavy Rain
Fri
Fri's Weather Conditions
Chance
Showers

Mostly Cloudy


Extended Forecast
 
National Weather Service Forecast for: Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 12:07 am PST Dec 31, 2025
 
Today

Today: Showers, mainly after 10am.  High near 66. North wind 5 to 10 mph, with gusts as high as 20 mph.  Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
High: 66 °F
Tonight

Tonight: Showers, with thunderstorms also possible after 10pm. Some of the storms could produce heavy rainfall.  Low around 53. Northeast wind around 5 mph.  Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Low: 53 °F
New
Year's
Day
New Year's Day: Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. Some of the storms could produce heavy rainfall.  High near 62. South wind around 5 mph.  Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
High: 62 °F
Thursday
Night
Thursday Night: A chance of showers, mainly before 10pm.  Mostly cloudy, with a low around 53. South wind around 5 mph becoming calm.  Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Low: 53 °F
Friday

Friday: Mostly cloudy, with a high near 63. Southeast wind around 5 mph.
High: 63 °F
Friday
Night
Friday Night: A slight chance of showers.  Mostly cloudy, with a low around 52. Chance of precipitation is 20%.
Low: 52 °F
Saturday

Saturday: A chance of showers.  Mostly cloudy, with a high near 63. Chance of precipitation is 50%.
High: 63 °F
Saturday
Night
Saturday Night: Showers likely.  Mostly cloudy, with a low around 51.
Low: 51 °F
Sunday

Sunday: A chance of showers.  Mostly cloudy, with a high near 62.
High: 62 °F
Showers
Heavy Rain
Heavy Rain
Chance
Showers
Mostly Cloudy
Slight Chance
Showers
Chance
Showers
Showers
Likely
Chance
Showers

Flood Watch


Today
 
Showers, mainly after 10am. High near 66. North wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
 
Showers, with thunderstorms also possible after 10pm. Some of the storms could produce heavy rainfall. Low around 53. Northeast wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
New Year's Day
 
Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. Some of the storms could produce heavy rainfall. High near 62. South wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Thursday Night
 
A chance of showers, mainly before 10pm. Mostly cloudy, with a low around 53. South wind around 5 mph becoming calm. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Friday
 
Mostly cloudy, with a high near 63. Southeast wind around 5 mph.
Friday Night
 
A slight chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 20%.
Saturday
 
A chance of showers. Mostly cloudy, with a high near 63. Chance of precipitation is 50%.
Saturday Night
 
Showers likely. Mostly cloudy, with a low around 51.
Sunday
 
A chance of showers. Mostly cloudy, with a high near 62.
Sunday Night
 
A chance of showers. Mostly cloudy, with a low around 49.
Monday
 
A chance of showers. Mostly cloudy, with a high near 62.
Monday Night
 
A chance of showers. Mostly cloudy, with a low around 49.
Tuesday
 
A chance of showers. Mostly cloudy, with a high near 63.

Forecast from NOAA-NWS for Fontana.



 


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