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The temperatures in Montana in May are quite cold with temperatures between 6°C and 18°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Montana. 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.
Please note that Montana can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in Montana in May 2025.
If you’re planning to visit Montana in the near future, we highly recommend that you review the 14 day weather forecast for Montana before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 0° / -8° | 4 | 13 | 14 | 31 mm | Awful | Montana in January |
| February | 0° / -9° | 4 | 10 | 15 | 37 mm | Awful | Montana in February |
| March | 8° / -3° | 5 | 15 | 11 | 51 mm | Bad | Montana in March |
| April | 12° / 1° | 6 | 17 | 7 | 74 mm | Bad | Montana in April |
| May | 18° / 6° | 8 | 22 | 1 | 92 mm | Ok | Montana in May |
| June | 25° / 10° | 5 | 25 | 0 | 62 mm | Perfect | Montana in June |
| July | 31° / 15° | 2 | 29 | 0 | 29 mm | Good | Montana in July |
| August | 29° / 15° | 2 | 29 | 0 | 42 mm | Good | Montana in August |
| September | 24° / 10° | 2 | 28 | 0 | 34 mm | Perfect | Montana in September |
| October | 14° / 3° | 3 | 24 | 4 | 57 mm | Ok | Montana in October |
| November | 7° / -3° | 4 | 18 | 8 | 31 mm | Bad | Montana in November |
| December | 0° / -8° | 5 | 11 | 14 | 28 mm | Awful | Montana in December |