Last updated: March 2, 2024
The weather in Rapid City, United States, during August is characterized by an average temperature of 20°C (69°F). Highs can soar to 34°C (93°F), while lows may dip to 8°C (46°F). Typically, the humidity level in Rapid City throughout August hovers around 85%.
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Average temperature
Maximum temperature
Humidity
In August, Rapid City averages 57 mm (2.2 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 13 hours 54 minutes of daylight, with the sun shining for approximately 11 hours 28 minutes each day. Additionally, there is a 72% probability of sunny days during this period.
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Chance of sun
In August, the UV Index in Rapid City reaches a maximum of 10, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 2 | 3 | 6 | 8 | 9 | 10 | 9 | 7 | 5 | 3 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||