United States of America
Rapid City sees feels-like daytime highs peak around 33.1°C in July and nighttime lows bottom out near -8.4°C in January. May is the wettest month (~64 mm), while January is the driest (~1 mm). For sunshine, July leads with about 75% clear skies.
Based on mild feels-like temperatures and low rain chances, the most comfortable months are June, September, and August — expect around 15.1–26.5°C with roughly 33% chance of rain on a given day in June.
| Month | Low / High °C | Rain % | Rainfall | Clear skies | Wind |
|---|---|---|---|---|---|
| January | -8.4° / 0.8° | 1% | 1 mm | 54% | 16.1 kph |
| February | -6.9° / 2.9° | 1% | 2 mm | 52% | 16 kph |
| March | -2.9° / 7.3° | 4% | 9 mm | 49% | 15.9 kph |
| April | 2.9° / 14° | 14% | 30 mm | 50% | 16 kph |
| May | 9.3° / 20.4° | 29% | 64 mm | 54% | 15.2 kph |
| June☀ | 15.1° / 26.5° | 33% | 59 mm | 66% | 13.7 kph |
| July | 19.3° / 33.1° | 29% | 43 mm | 75% | 12.6 kph |
| August☀ | 18.2° / 32.9° | 22% | 34 mm | 74% | 12.7 kph |
| September☀ | 12.2° / 25.2° | 15% | 29 mm | 68% | 13.8 kph |
| October | 5° / 15.5° | 10% | 24 mm | 60% | 14.9 kph |
| November | -2.3° / 6.4° | 3% | 6 mm | 55% | 15.3 kph |
| December | -7.3° / 0.9° | 1% | 1 mm | 56% | 15.7 kph |
Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).
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