Wind Cave National Park weather in September
September in Wind Cave National Park: warm, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in Wind Cave National Park · #123 of 604 destinations to visit in September · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Wind Cave National Park climate normals — September
| Daytime high | 26°C / 79°F | 🌤 warm |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 39 mm / 1.5 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 52% | 🍃 comfortable |
| Dew point | 7°C / 45°F | |
| Sunshine | 10.5 h/day | |
| Daylight | 12.5 h | |
| Wind | 18 km/h / 11 mph | |
| Snowfall | 0.6 cm / 0.2 in | |
| Air quality (US AQI) | 40 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Wind Cave National Park?
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Wind Cave National Park in September — FAQ
- Is September a good time to visit Wind Cave National Park?
- September in Wind Cave National Park: warm, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Wind Cave National Park on SeasonMap's comfort score (88/100).
- What is the weather like in Wind Cave National Park in September?
- In September, Wind Cave National Park averages a daily high of 26°C and a low of 12.2°C, with about 38.7 mm of rain over roughly 7 rainy days.
- What is the air quality in Wind Cave National Park in September?
- Wind Cave National Park has a mean US Air Quality Index of about 40 in September.