National Weather Service Forecast for: 3 Miles SW Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 1:04 pm PDT Jun 19, 2026
 
Tonight

Tonight: Increasing clouds, with a low around 57. West wind 5 to 15 mph, with gusts as high as 20 mph.
Increasing
Clouds
 Saturday

Saturday: Partly sunny, then gradually becoming sunny, with a high near 80. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Becoming
Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 57. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Mostly Clear
 Sunday

Sunday: Sunny, with a high near 82. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Sunny
 Sunday
Night
Sunday Night: Clear, with a low around 58. Southwest wind 5 to 10 mph becoming light west after midnight.
Clear
 Monday

Monday: Sunny, with a high near 87.
Sunny
 Monday
Night
Monday Night: Clear, with a low around 60.
Clear
 Tuesday

Tuesday: Sunny, with a high near 94.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 63.
Mostly Clear
Lo 57 °F Hi 80 °F Lo 57 °F Hi 82 °F Lo 58 °F Hi 87 °F Lo 60 °F Hi 94 °F Lo 63 °F

 

Tonight
 
 Increasing clouds, with a low around 57. West wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday
 
 Partly sunny, then gradually becoming sunny, with a high near 80. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
 
 Mostly clear, with a low around 57. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
 
 Sunny, with a high near 82. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
 
 Clear, with a low around 58. Southwest wind 5 to 10 mph becoming light west after midnight.
Monday
 
 Sunny, with a high near 87.
Monday Night
 
 Clear, with a low around 60.
Tuesday
 
 Sunny, with a high near 94.
Tuesday Night
 
 Mostly clear, with a low around 63.
Wednesday
 
 Sunny, with a high near 95.
Wednesday Night
 
 Mostly clear, with a low around 64.
Thursday
 
 Sunny, with a high near 95.
Thursday Night
 
 Clear, with a low around 63.
Friday
 
 Sunny, with a high near 90.

 

Forecast from NOAA-NWS for 3 Miles SW Fontana CA.