Mammoth Cave National Park in August
August at Mammoth Cave National Park averages a daytime high near 90°F and an overnight low around 67°F, with about 3.8" of precipitation. Visitation runs about 1.4× the park's average month, which makes August a busy month here.
- Average low
- 67°F
- Average high
- 90°F
Range across the year: 29°F to 91°F
- Precipitation
- 3.8 in
- Daylight
- 13.4 hours
Roughly 12% of the park's yearly visitors come in August: about 67,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes August the 3rd-busiest of the park's twelve months, sitting between the July peak (2×) and the January low (0.3×).
On our Best Time to Visit score August rates 41/100 ("Poor"). Our recommended month is September: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 79°F is hot, with afternoons near 90°F to plan the day around. These figures are 1991–2020 NOAA climate normals from the nearest station, about 4.7 miles from the park.
August falls inside the park's busiest stretch: June, July and August together pull about 42% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.
You'll have about 13.4 hours of daylight in August to explore — between the 9.5-hour midwinter low and the 14.5-hour summer high.
Park-wide, 2025 drew 660,734 recreation visits, down 11.6% from 747,042 in 2024.
Across the past decade overall visitation has risen about 27.1%, so a August visit is likely to feel busier than it did a few years ago.
How August compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| July | 91°F / 68°F | 2.0× Very busy | 23 Poor |
| August | 90°F / 67°F | 1.4× Busy | 41 Poor |
| September | 85°F / 60°F | 1.0× Average | 65 Good |
All twelve months at Mammoth Cave, with the best time to visit.
Things to do at Mammoth Cave in August
The National Park Service tags 17 Mammoth Cave activities for summer. Here are 8 of them. Each links to the park's own page for it.
- Dennison Ferry to Green River Ferry · 150-240 minutes
- Green River Ferry to Houchin Ferry · 4-6 hours
- Houchin Ferry to Brownsville · 90-120 minutes
- Nolin River Dam to Houchin Ferry · 4-6 hours
- Planning Your River Trip
- River Safety and Regulations
- Explore Wildflowers at Cedar Sink · 45-60 minutes
- Attend a Ranger-led Program · 10-60 minutes
Frequently Asked Questions
August averages a daytime high near 90°F and an overnight low around 67°F at Mammoth Cave National Park, with about 3.8 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 4.7 miles from the park, so conditions inside the park can differ, especially at other elevations.
August is busy at Mammoth Cave National Park (about 1.4× the average month). Our best-time score rates it "Poor" at 41/100. Our recommended month is September.
The busiest month is July and the quietest is January. August sits at about 1.4× the park's average, or 12% of annual visitation.
A typical August sees about 67,000 recreation visits at Mammoth Cave National Park, based on National Park Service monthly counts from 1979–2025.
Where to stay near Mammoth Cave in August
Booking a August trip to Mammoth Cave National Park? Compare hotels, cabins and vacation rentals near the park with live August availability and prices.
Top-rated places to stay near Mammoth Cave
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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See the full ranking of the best national parks to visit in August.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.