Rapid City Climate: Weather by Month and Best Time to Visit
Best months for Rapid City: September, August.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 3°C | -8°C | 13 mm | 4 | – | – | 4.8 |
| February | 4°C | -7°C | 20 mm | 5 | – | – | 4.8 |
| March | 9°C | -3°C | 40 mm | 8 | – | – | 5.7 |
| April | 14°C | 1°C | 80 mm | 11 | – | – | 6.1 |
| May | 19°C | 6°C | 112 mm | 14 | – | – | 6.5 |
| June | 24°C | 12°C | 97 mm | 14 | – | – | 7.1 |
| July | 29°C | 15°C | 78 mm | 14 | – | – | 7.3 |
| August | 28°C | 14°C | 61 mm | 11 | – | – | 7.6 |
| September | 24°C | 9°C | 41 mm | 7 | – | – | 8.2 |
| October | 15°C | 3°C | 50 mm | 7 | – | – | 7.0 |
| November | 8°C | -3°C | 20 mm | 4 | – | – | 5.9 |
| December | 3°C | -7°C | 15 mm | 4 | – | – | 5.0 |