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The temperatures in Sioux Falls in May are usually low and can range between 10°C and 20°C.
You can expect rain for roughly half of the month of May in Sioux Falls. 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.
Our weather forecast can give you a great sense of what weather to expect in Sioux Falls in May 2025.
If you’re planning to visit Sioux Falls in the near future, we highly recommend that you review the 14 day weather forecast for Sioux Falls before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -5° / -13° | 2 | 15 | 13 | 35 mm | Awful | Sioux Falls in January |
| February | -4° / -12° | 2 | 15 | 11 | 39 mm | Awful | Sioux Falls in February |
| March | 6° / -2° | 5 | 17 | 9 | 67 mm | Awful | Sioux Falls in March |
| April | 13° / 3° | 6 | 20 | 4 | 110 mm | Bad | Sioux Falls in April |
| May | 20° / 10° | 9 | 22 | 0 | 135 mm | Ok | Sioux Falls in May |
| June | 25° / 16° | 8 | 22 | 0 | 185 mm | Good | Sioux Falls in June |
| July | 28° / 17° | 6 | 25 | 0 | 109 mm | Perfect | Sioux Falls in July |
| August | 28° / 15° | 6 | 25 | 0 | 118 mm | Perfect | Sioux Falls in August |
| September | 24° / 12° | 5 | 25 | 0 | 94 mm | Perfect | Sioux Falls in September |
| October | 14° / 5° | 4 | 25 | 2 | 83 mm | Ok | Sioux Falls in October |
| November | 7° / -1° | 2 | 23 | 5 | 33 mm | Bad | Sioux Falls in November |
| December | -2° / -9° | 3 | 16 | 12 | 43 mm | Awful | Sioux Falls in December |