National Weather Service Forecast for: Rancho Cucamonga CA
Issued by: National Weather Service San Diego, CA
Updated: 12:57 pm PDT Jul 5, 2025
 
Tonight

Tonight: Clear, with a low around 62. West wind 5 to 10 mph becoming light and variable  in the evening.
Clear
Sunday

Sunday: Sunny, with a high near 90. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Sunny
Sunday
Night
Sunday Night: Clear, with a low around 61. Southwest wind 5 to 10 mph becoming light  after midnight.
Clear
Monday

Monday: Sunny, with a high near 91. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Sunny
Monday
Night
Monday Night: Clear, with a low around 63. Southwest wind 5 to 10 mph becoming light west  after midnight.
Clear
Tuesday

Tuesday: Sunny, with a high near 95.
Sunny
Tuesday
Night
Tuesday Night: Mostly clear, with a low around 68.
Mostly Clear
Wednesday

Wednesday: Sunny, with a high near 101.
Sunny
Wednesday
Night
Wednesday Night: Mostly clear, with a low around 69.
Mostly Clear
Lo 62 °F Hi 90 °F Lo 61 °F Hi 91 °F Lo 63 °F Hi 95 °F Lo 68 °F Hi 101 °F Lo 69 °F

 

Tonight
 
Clear, with a low around 62. West wind 5 to 10 mph becoming light and variable in the evening.
Sunday
 
Sunny, with a high near 90. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Sunday Night
 
Clear, with a low around 61. Southwest wind 5 to 10 mph becoming light after midnight.
Monday
 
Sunny, with a high near 91. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Monday Night
 
Clear, with a low around 63. Southwest wind 5 to 10 mph becoming light west after midnight.
Tuesday
 
Sunny, with a high near 95.
Tuesday Night
 
Mostly clear, with a low around 68.
Wednesday
 
Sunny, with a high near 101.
Wednesday Night
 
Mostly clear, with a low around 69.
Thursday
 
Sunny, with a high near 101.
Thursday Night
 
Clear, with a low around 68.
Friday
 
Sunny, with a high near 97.
Friday Night
 
Mostly clear, with a low around 66.
Saturday
 
Sunny, with a high near 93.

 

Forecast from NOAA-NWS for Rancho Cucamonga CA.