National Weather Service Forecast for: 3 Miles SW Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 12:48 am PDT Jun 30, 2026
 
Overnight

Overnight: Mostly cloudy, with a low around 57. West wind around 5 mph.
Mostly Cloudy

 Tuesday

Tuesday: 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.
Becoming
Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 2am. Otherwise, increasing clouds, with a low around 57. West wind 5 to 10 mph, with gusts as high as 20 mph.
Mostly Clear
then Patchy
Fog
 Wednesday

Wednesday: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 80. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 57. Southwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 20 mph.
Mostly Clear

 Thursday

Thursday: Patchy fog before 11am. Otherwise, sunny, with a high near 84.
Patchy Fog
then Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 59.
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 57 °F Hi 80 °F Lo 57 °F Hi 84 °F Lo 59 °F Hi 86 °F Lo 60 °F

 

Overnight
 
 Mostly cloudy, with a low around 57. West wind around 5 mph.
Tuesday
 
 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
 
 Patchy fog after 2am. Otherwise, increasing clouds, with a low around 57. 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 80. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
 
 Mostly clear, with a low around 57. Southwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 20 mph.
Thursday
 
 Patchy fog before 11am. Otherwise, sunny, with a high near 84.
Thursday Night
 
 Mostly clear, with a low around 59.
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 90.

 

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