National Weather Service Forecast for: Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 8:38 pm PDT Jun 29, 2026
 
Tonight

Tonight: Patchy drizzle after 2am. Patchy fog between 11pm and 2am. Otherwise, increasing clouds, with a low around 57. West wind 5 to 10 mph.
Patchy Fog
then Patchy
Drizzle and
Patchy Fog
 Tuesday

Tuesday: Patchy drizzle before 11am. Mostly cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Patchy
Drizzle then
Sunny
 Tuesday
Night
Tuesday Night: Increasing clouds, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph.
Increasing
Clouds

 Wednesday

Wednesday: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 81. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Patchy Fog
then Sunny

 Wednesday
Night
Wednesday Night: Clear, with a low around 56. Southwest wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.
Clear

 Thursday

Thursday: Sunny, with a high near 83.
Sunny

 Thursday
Night
Thursday Night: Mostly clear, with a low around 58.
Mostly Clear

 Friday

Friday: Sunny, with a high near 86.
Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 60.
Mostly Clear
Lo 57 °F Hi 78 °F Lo 56 °F Hi 81 °F Lo 56 °F Hi 83 °F Lo 58 °F Hi 86 °F Lo 60 °F

 

Tonight
 
 Patchy drizzle after 2am. Patchy fog between 11pm and 2am. Otherwise, increasing clouds, with a low around 57. West wind 5 to 10 mph.
Tuesday
 
 Patchy drizzle before 11am. Mostly cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
 
 Increasing clouds, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
 
 Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 81. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
 
 Clear, with a low around 56. Southwest wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.
Thursday
 
 Sunny, with a high near 83.
Thursday Night
 
 Mostly clear, with a low around 58.
Friday
 
 Sunny, with a high near 86.
Friday Night
 
 Mostly clear, with a low around 60.
Independence Day
 
 Mostly sunny, with a high near 89.
Saturday Night
 
 Mostly clear, with a low around 61.
Sunday
 
 Sunny, with a high near 89.
Sunday Night
 
 Mostly clear, with a low around 62.
Monday
 
 Sunny, with a high near 91.

 

Forecast from NOAA-NWS for Fontana CA.