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Best time to visit · Indiana, United States
On the climate data, the best time to visit Indiana Dunes is September, scoring up to 88/100 with highs around 76°F (24°C) and 3.1 in (80 mm) of rain in September. May & June, August and October are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
Highs run from 32°F to 83°F across the year, and the yearly total is about 38.7 in (984 mm) of rain and snow.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 32°F0°C | 35°F1°C | 46°F8°C | 58°F15°C | 69°F20°C | 78°F26°C | 83°F28°C | 82°F28°C | 76°F24°C | 62°F17°C | 49°F9°C | 37°F3°C |
| Avg low | 19°F-7°C | 20°F-6°C | 29°F-2°C | 39°F4°C | 50°F10°C | 60°F16°C | 66°F19°C | 64°F18°C | 57°F14°C | 45°F7°C | 34°F1°C | 25°F-4°C |
| Rain/snow | 2.3 in58 mm | 2.2 in56 mm | 2.4 in62 mm | 3.5 in90 mm | 4.4 in111 mm | 3.9 in98 mm | 4.0 in101 mm | 4.3 in108 mm | 3.1 in80 mm | 3.7 in95 mm | 2.6 in65 mm | 2.4 in60 mm |
| Humidity | 87% | 85% | 81% | 77% | 78% | 77% | 74% | 72% | 73% | 75% | 80% | 86% |
| Cloud | 71% | 70% | 66% | 63% | 64% | 56% | 48% | 48% | 46% | 58% | 63% | 73% |
| Comfort | 44 | 45 | 54 | 73 | 80 | 79 | 79 | 81 | 88 | 80 | 60 | 43 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. The grid cell sits at about 216 m (709 ft), close to Indiana Dunes's own ~182 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The coldest season, with highs of 32–37°F (0–3°C) and lows down to 19°F (-7°C). It's the driest season, with only about 6.9 in (174 mm) of rain or snow, 18% of the year's total. December – February are cold enough for snow. Comfort scores bottom out in December – February; the season averages 44/100.
Temperatures climb through the season, from 46°F highs in March to 69°F by May. About 10.4 in (263 mm) of rain falls across these months, 27% of the year's total. Nights dip below freezing in March. May score well without being the very best (season average 69/100).
The warmest stretch of the year, with highs of 78–83°F (26–28°C). It's the wettest season, with about 12.1 in (307 mm) of rain, 31% of the year's total. June feels humid, with humidity near 77%. June and August score well without being the very best (season average 80/100).
Temperatures slide from 76°F highs in September to 49°F by November. About 9.4 in (240 mm) of rain falls across these months, 24% of the year's total. Lows bottom out around 34°F (1°C). September is among the best-scoring months (season average 76/100).
By comfort score: 6 Great, 2 Good, 2 Fair and 2 Tough. Great months: May – October. Tap a month for its own guide.
On the climate data, the best time to visit Indiana Dunes is September, scoring up to 88/100 with highs around 76°F (24°C) and 3.1 in (80 mm) of rain in September. May & June, August and October are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
May is the wettest month, averaging about 4.4 in (111 mm) of rain. February is the driest, with about 2.2 in (56 mm). The yearly total is around 38.7 in (984 mm).
January is the coldest, with average lows of 19°F (-7°C) and highs of 32°F (0°C). The warmest is July, with average highs of 83°F (28°C).
Yes: in June humidity averages 77% with warm temperatures, so it feels muggy. Summer highs peak around 83°F (28°C).
On average, yes: lows fall below 32°F (0°C) in December – March, bottoming out around 19°F (-7°C) in January.
Poll the group on September dates, then plan the days, packing and costs together.
