Click on a day for an hourly weather forecast
The temperatures in Idaho Falls in August are comfortable with low of 12°C and and high up to 30°C.
The wather in Idaho Falls 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 Idaho Falls in August 2025.
If you’re planning to visit Idaho Falls in the near future, we highly recommend that you review the 14 day weather forecast for Idaho Falls before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -11° | 4 | 9 | 18 | 34 mm | Awful | Idaho Falls in January |
| February | -1° / -9° | 6 | 6 | 18 | 31 mm | Awful | Idaho Falls in February |
| March | 6° / -3° | 6 | 14 | 12 | 40 mm | Awful | Idaho Falls in March |
| April | 12° / 1° | 6 | 19 | 6 | 43 mm | Bad | Idaho Falls in April |
| May | 18° / 5° | 6 | 23 | 1 | 59 mm | Good | Idaho Falls in May |
| June | 25° / 8° | 3 | 27 | 0 | 32 mm | Perfect | Idaho Falls in June |
| July | 31° / 12° | 1 | 30 | 0 | 22 mm | Good | Idaho Falls in July |
| August | 30° / 12° | 2 | 29 | 0 | 38 mm | Good | Idaho Falls in August |
| September | 25° / 9° | 3 | 27 | 0 | 47 mm | Perfect | Idaho Falls in September |
| October | 14° / 3° | 4 | 25 | 2 | 44 mm | Ok | Idaho Falls in October |
| November | 6° / -3° | 4 | 17 | 9 | 26 mm | Awful | Idaho Falls in November |
| December | -2° / -9° | 5 | 8 | 18 | 35 mm | Awful | Idaho Falls in December |