Click on a day for an hourly weather forecast
The temperatures in Idaho Falls in May are quite cold with temperatures between 5°C and 18°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Idaho Falls during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Please note that Idaho Falls can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in Idaho Falls in May 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 |