Click on a day for an hourly weather forecast
The temperatures in Casper in August are comfortable with low of 13°C and and high up to 27°C.
The wather in Casper in August can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
Our weather forecast can give you a great sense of what weather to expect in Casper in August 2025.
If you’re planning to visit Casper in the near future, we highly recommend that you review the 14 day weather forecast for Casper before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -1° / -12° | 5 | 12 | 14 | 37 mm | Awful | Casper in January |
| February | -1° / -12° | 6 | 6 | 17 | 51 mm | Awful | Casper in February |
| March | 6° / -6° | 6 | 11 | 14 | 72 mm | Awful | Casper in March |
| April | 9° / -3° | 6 | 10 | 14 | 92 mm | Bad | Casper in April |
| May | 15° / 3° | 9 | 14 | 8 | 99 mm | Bad | Casper in May |
| June | 23° / 9° | 4 | 25 | 1 | 49 mm | Perfect | Casper in June |
| July | 28° / 13° | 2 | 29 | 0 | 40 mm | Perfect | Casper in July |
| August | 27° / 13° | 2 | 29 | 0 | 38 mm | Perfect | Casper in August |
| September | 22° / 9° | 3 | 26 | 1 | 37 mm | Good | Casper in September |
| October | 12° / 0° | 3 | 19 | 8 | 61 mm | Bad | Casper in October |
| November | 6° / -5° | 5 | 14 | 11 | 35 mm | Awful | Casper in November |
| December | -1° / -11° | 7 | 10 | 14 | 45 mm | Awful | Casper in December |