Theodore Roosevelt National Park weather in September
September in Theodore Roosevelt National Park: nice, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in Theodore Roosevelt National Park · #150 of 604 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Theodore Roosevelt National Park climate normals — September
| Daytime high | 25°C / 76°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Feels like (high) | 22°C / 72°F | |
| Rainfall | 44 mm / 1.7 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 54% | 🍃 comfortable |
| Dew point | 7°C / 45°F | |
| Sunshine | 10 h/day | |
| Daylight | 12.5 h | |
| Wind | 25 km/h / 15 mph | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Theodore Roosevelt National Park?
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Theodore Roosevelt National Park in September — FAQ
- Is September a good time to visit Theodore Roosevelt National Park?
- September in Theodore Roosevelt National Park: nice, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Theodore Roosevelt National Park on SeasonMap's comfort score (87/100).
- What is the weather like in Theodore Roosevelt National Park in September?
- In September, Theodore Roosevelt National Park averages a daily high of 24.7°C and a low of 12°C, with about 43.8 mm of rain over roughly 5.8 rainy days.
- What is the air quality in Theodore Roosevelt National Park in September?
- Theodore Roosevelt National Park has a mean US Air Quality Index of about 41 in September.