The weather in Rialto in August is hot. The average temperatures are between 16°C and 34°C. Usually the days in August are hot while the nights are a bit cooler.
There shouldn't be any rainy days in in Rialto 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 Rialto in August 2025.
If you’re planning to visit Rialto in the near future, we highly recommend that you review the 14 day weather forecast for Rialto before you arrive.
Temperatures
34° / 16°
Rainy Days
0
Snowy Days
0
Dry Days
31
Rainfall
10
mm
Sun Hours
12.0
Hrs
