Rapid City in August
7.6out of 10
Yes, a good time to go
Warm and comfortable: highs around 28°C. Frequent rain: about 11 rainy days.
28°CAvg high
14°CAvg low
11Rainy days (61 mm)
13:50 hDaylight
06:02Sunrise · 19:52 Sunset
Why this score
- Warm and comfortable: highs around 28°C
- Frequent rain: about 11 rainy days
What to wear and pack
- T-shirts and light layers
- A light jacket for cooler evenings
- Shorts or a light skirt
- Rain jacket or compact umbrella
- Sunscreen, sunglasses and a hat
How reliable is the forecast?
Rainfall in August is fairly consistent from year to year (2.9 days). Averages cover 30 years (1991–2020). Individual days can differ a lot.
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 |
Frequently asked questions
How hot is Rapid City in August?
Daytime highs average 28°C and nights about 14°C.
When is the best time to visit Rapid City?
The best months are September, August.