Click on a day for an hourly weather forecast
The weather in Casper in May is very cold with temperatures between 3°C and 15°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Casper. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Casper is going to experience quite a number of days of snow during May. It’s the perfect time to build snowmen, drink hot cocoa, and have a snowball fight. Just remember to wear a warm scarf and a pair of mittens!
Our weather forecast can give you a great sense of what weather to expect in Casper in May 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 |