Mammoth Cave National Park in September
In September, Mammoth Cave National Park averages a high of 85°F and a low of 60°F, with 4.0 inches of precipitation (rain plus melted snow). About 56,000 people visit, the 7th busiest of 12 (busy). Days are 12 hours 22 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 85° / 60°F
- Precipitation
- 4.0in
- Snow
- 0in
- Daylight
- 12h 22m
- Visitors
- 56,000
- Crowds
- Busy
Best months for weather and crowds instead: October (moderate) and November (moderate).
Weather 1991–2020 averages at Mammoth Cave, KY, 4.2 miles from the park's center, 760 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in September
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Great Smoky Mountains National Park | 78° / 56° | Busy | Mild |
| Kennesaw Mountain National Battlefield Park | 80° / 62° | Very busy | Mild |
| Gateway Arch National Park | 81° / 57° | Moderate | Hot |
| Chattahoochee River National Recreation Area | 83° / 63° | Very busy | Hot |
| New River Gorge National Park and Preserve | 75° / 54° | Busy | Mild |
Closures, reservations and alerts: Mammoth Cave National Park on nps.gov
All twelve months at Mammoth Cave · National parks to visit in September