The weather in Rancho Cucamonga in August is hot. The average temperatures are between 22°C and 32°C.
There shouldn't be any rainy days in in Rancho Cucamonga during August. Having said that, the days are very hot in August so hanging out outside is more recomanded during the after noons and evening time.
Our weather forecast can give you a great sense of what weather to expect in Rancho Cucamonga in August 2025.
If you’re planning to visit Rancho Cucamonga in the near future, we highly recommend that you review the 14 day weather forecast for Rancho Cucamonga before you arrive.
Temperatures
32° / 22°
Rainy Days
0
Snowy Days
0
Dry Days
31
Rainfall
6
mm
Sun Hours
12.0
Hrs
