National Weather Service Forecast for: Rancho Cucamonga CA
Issued by: National Weather Service San Diego, CA
Updated: 1:07 pm PDT Jul 24, 2025
 
Overnight

Overnight: Mostly clear, with a low around 58. Southwest wind around 5 mph becoming calm.
Mostly Clear
Friday

Friday: Sunny, with a high near 82. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 20 mph.
Sunny
Friday
Night
Friday Night: Partly cloudy, with a low around 56. Southwest wind 5 to 10 mph becoming light  after midnight. Winds could gust as high as 20 mph.
Partly Cloudy
Saturday

Saturday: Patchy fog before 11am.  Otherwise, mostly sunny, with a high near 80. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Patchy Fog
then Sunny
Saturday
Night
Saturday Night: Mostly clear, with a low around 57. Southwest wind 5 to 10 mph becoming light west  after midnight.
Mostly Clear
Sunday

Sunday: Sunny, with a high near 86.
Sunny
Sunday
Night
Sunday Night: Mostly clear, with a low around 60.
Mostly Clear
Monday

Monday: Sunny, with a high near 90.
Sunny
Monday
Night
Monday Night: Mostly clear, with a low around 62.
Mostly Clear
Lo 58 °F Hi 82 °F Lo 56 °F Hi 80 °F Lo 57 °F Hi 86 °F Lo 60 °F Hi 90 °F Lo 62 °F

 

Overnight
 
Mostly clear, with a low around 58. Southwest wind around 5 mph becoming calm.
Friday
 
Sunny, with a high near 82. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
 
Partly cloudy, with a low around 56. Southwest wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.
Saturday
 
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 80. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Saturday Night
 
Mostly clear, with a low around 57. Southwest wind 5 to 10 mph becoming light west after midnight.
Sunday
 
Sunny, with a high near 86.
Sunday Night
 
Mostly clear, with a low around 60.
Monday
 
Sunny, with a high near 90.
Monday Night
 
Mostly clear, with a low around 62.
Tuesday
 
Sunny, with a high near 92.
Tuesday Night
 
Mostly clear, with a low around 64.
Wednesday
 
Sunny, with a high near 93.
Wednesday Night
 
Mostly clear, with a low around 64.
Thursday
 
Sunny, with a high near 92.

 

Forecast from NOAA-NWS for Rancho Cucamonga CA.