Indiana Dunes National Park in August
Indiana Dunes National Park · crowd + weather almanac
August crowd level
busiest stretch
about 398,000 visits in a
typical August
The 2nd-busiest month of the year ·
median of 2016–2025 official NPS counts
August is the 2nd-busiest month of the year at Indiana Dunes National Park: about 398,000 recreation visits in a typical August (17% of the year's traffic, and 91% of what the peak month, July, sees). This is high season — the park is at or near its busiest. Weather-wise, August days at the Indiana Dunes Nl, IN station typically top out around 80°F with nights near 63°F, and about 4.1 inches of precipitation falls over the month.
- Typical August: 397,679 recreation visits (median 2016–2025); the range across those years ran 204,010 (2018) to 470,160 (2022).
- Busier than 10 of the other 11 months.
- 1991–2020 August normals at Indiana Dunes Nl, IN: high 80°F, low 63°F, 4.08 in precipitation, 0.0 in snow.
- Similar daytime temperatures, thinner crowds: September typically runs 74°F days with about 39% fewer visits (243,000 vs 398,000).
August weather (1991–2020 normals)
| Typical daytime high | 80°F |
|---|---|
| Typical overnight low | 63°F |
| Precipitation (monthly normal) | 4.08 in |
| Snowfall (monthly normal) | 0.0 in |
| Measured at | Indiana Dunes Nl, IN (USC00124244), 2.4 mi from the park reference point, elev. 680 ft |
Every month at Indiana Dunes
| Month | Typical visits | Crowds | High / Low | Precip |
|---|---|---|---|---|
| January | 71,142 | quiet | 32°F / 18°F | 2.2 in |
| February | 85,577 | quiet | 36°F / 21°F | 2.0 in |
| March | 124,061 | quiet | 46°F / 30°F | 2.3 in |
| April | 122,599 | quiet | 57°F / 40°F | 3.5 in |
| May | 204,925 | moderate | 68°F / 50°F | 4.3 in |
| June | 330,558 | busy | 78°F / 60°F | 4.3 in |
| July | 436,351 | busiest stretch | 82°F / 64°F | 4.0 in |
| August | 397,679 | busiest stretch | 80°F / 63°F | 4.1 in |
| September | 242,939 | moderate | 74°F / 56°F | 3.6 in |
| October | 184,907 | moderate | 62°F / 45°F | 3.8 in |
| November | 95,411 | quiet | 49°F / 34°F | 2.8 in |
| December | 88,593 | quiet | 37°F / 24°F | 2.3 in |