Sioux Falls Climate: Weather by Month and Best Time to Visit
Best months for Sioux Falls: September, July, August.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -3°C | -12°C | 20 mm | 5 | – | – | 4.5 |
| February | 0°C | -10°C | 24 mm | 5 | – | – | 4.4 |
| March | 7°C | -4°C | 47 mm | 7 | – | – | 5.5 |
| April | 15°C | 3°C | 90 mm | 10 | – | – | 6.5 |
| May | 21°C | 10°C | 114 mm | 13 | – | – | 7.1 |
| June | 27°C | 16°C | 131 mm | 12 | – | – | 7.2 |
| July | 29°C | 18°C | 84 mm | 9 | – | – | 7.9 |
| August | 27°C | 16°C | 84 mm | 9 | – | – | 7.9 |
| September | 24°C | 12°C | 81 mm | 8 | – | – | 8.0 |
| October | 16°C | 4°C | 61 mm | 7 | – | – | 7.1 |
| November | 7°C | -3°C | 40 mm | 6 | – | – | 5.5 |
| December | -1°C | -9°C | 27 mm | 5 | – | – | 4.4 |