Badlands National Park weather in September
September in Badlands National Park: warm, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in Badlands National Park · #158 of 604 destinations to visit in September · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Badlands National Park climate normals — September
| Daytime high | 28°C / 82°F | 🌤 warm |
|---|---|---|
| Nighttime low | 14°C / 57°F | |
| Feels like (high) | 26°C / 79°F | |
| Rainfall | 36 mm / 1.4 in | 🌦 some rain |
| Rainy days | 5 days | |
| Humidity | 51% | 🍃 comfortable |
| Dew point | 9°C / 48°F | |
| Sunshine | 10.5 h/day | |
| Daylight | 12.5 h | |
| Wind | 22 km/h / 14 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Badlands National Park?
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Badlands National Park in September — FAQ
- Is September a good time to visit Badlands National Park?
- September in Badlands National Park: warm, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Badlands National Park on SeasonMap's comfort score (86/100).
- What is the weather like in Badlands National Park in September?
- In September, Badlands National Park averages a daily high of 27.5°C and a low of 13.9°C, with about 36.1 mm of rain over roughly 5 rainy days.
- What is the air quality in Badlands National Park in September?
- Badlands National Park has a mean US Air Quality Index of about 39 in September.