National Weather Service Forecast for: Rancho Cucamonga CA
Issued by: National Weather Service San Diego, CA
Updated: 11:35 am PST Nov 1, 2026
 
Tonight

Tonight: Mostly clear, with a low around 51. West wind around 5 mph becoming calm.
Mostly Clear
 Monday

Monday: Sunny, with a high near 74. Calm wind becoming west around 5 mph in the afternoon.
Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 55. Calm wind.
Partly Cloudy
 Tuesday

Tuesday: Mostly sunny, with a high near 73. Calm wind becoming southwest around 5 mph in the afternoon.
Mostly Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 53. West wind around 5 mph becoming calm.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 73.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 55.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 75.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 55.
Mostly Clear
Lo 51 °F Hi 74 °F Lo 55 °F Hi 73 °F Lo 53 °F Hi 73 °F Lo 55 °F Hi 75 °F Lo 55 °F

 

Tonight
 
 Mostly clear, with a low around 51. West wind around 5 mph becoming calm.
Monday
 
 Sunny, with a high near 74. Calm wind becoming west around 5 mph in the afternoon.
Monday Night
 
 Partly cloudy, with a low around 55. Calm wind.
Tuesday
 
 Mostly sunny, with a high near 73. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
 
 Mostly clear, with a low around 53. West wind around 5 mph becoming calm.
Wednesday
 
 Sunny, with a high near 73.
Wednesday Night
 
 Mostly clear, with a low around 55.
Thursday
 
 Sunny, with a high near 75.
Thursday Night
 
 Mostly clear, with a low around 55.
Friday
 
 Sunny, with a high near 77.
Friday Night
 
 Clear, with a low around 57.
Saturday
 
 Sunny, with a high near 80.
Saturday Night
 
 Mostly clear, with a low around 58.
Sunday
 
 Sunny, with a high near 80.

 

Forecast from NOAA-NWS for Rancho Cucamonga CA.