August in Gary averages a daily high of 26.7°C with nights around 17.3°C. Expect roughly 9.8 wet days totalling 104.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Gary is May–September.
Based on INDIANA DUNES NATIONAL PARK, IN US (21.9km), 1995–2024. 26 years of August data.