Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 18° / 5° | 2 | 29 | 0 | 50 mm | Good | Rialto in January |
| February | 18° / 5° | 2 | 26 | 0 | 55 mm | Good | Rialto in February |
| March | 20° / 5° | 2 | 29 | 0 | 31 mm | Good | Rialto in March |
| April | 23° / 7° | 1 | 29 | 0 | 23 mm | Perfect | Rialto in April |
| May | 26° / 9° | 0 | 31 | 0 | 7 mm | Perfect | Rialto in May |
| June | 31° / 12° | 0 | 30 | 0 | 2 mm | Good | Rialto in June |
| July | 34° / 15° | 1 | 30 | 0 | 18 mm | Ok | Rialto in July |
| August | 34° / 16° | 0 | 31 | 0 | 10 mm | Ok | Rialto in August |
| September | 32° / 14° | 0 | 30 | 0 | 7 mm | Good | Rialto in September |
| October | 27° / 10° | 0 | 31 | 0 | 8 mm | Perfect | Rialto in October |
| November | 22° / 7° | 1 | 29 | 0 | 18 mm | Good | Rialto in November |
| December | 17° / 4° | 3 | 28 | 0 | 63 mm | Good | Rialto in December |