United States of America
Sioux Falls sees feels-like daytime highs peak around 33.5°C in July and nighttime lows bottom out near -12.9°C in January. June is the wettest month (~90 mm), while January is the driest (~2 mm). For sunshine, July leads with about 72% clear skies.
Based on mild feels-like temperatures and low rain chances, the most comfortable months are September, June, and August — expect around 13.3–24.9°C with roughly 25% chance of rain on a given day in September.
| Month | Low / High °C | Rain % | Rainfall | Clear skies | Wind |
|---|---|---|---|---|---|
| January | -12.9° / -5.5° | 1% | 2 mm | 45% | 18.9 kph |
| February | -10.5° / -2.3° | 2% | 4 mm | 46% | 19.3 kph |
| March | -3.4° / 5.2° | 9% | 23 mm | 47% | 20.5 kph |
| April | 3.8° / 14.4° | 22% | 53 mm | 49% | 20.9 kph |
| May | 11.1° / 22.6° | 33% | 76 mm | 54% | 19.5 kph |
| June☀ | 18° / 30.3° | 37% | 90 mm | 63% | 17.2 kph |
| July | 21.8° / 33.5° | 34% | 74 mm | 72% | 15.4 kph |
| August☀ | 19.3° / 30.7° | 30% | 68 mm | 71% | 15.5 kph |
| September☀ | 13.3° / 24.9° | 25% | 62 mm | 68% | 17.5 kph |
| October | 5.2° / 15.9° | 15% | 42 mm | 59% | 18.4 kph |
| November | -3.4° / 4.5° | 6% | 16 mm | 51% | 18.5 kph |
| December | -10.6° / -3.2° | 2% | 5 mm | 46% | 18.6 kph |
Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).
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