July in Gary averages a daily high of 27.5°C with nights around 17.8°C. Expect roughly 9.6 wet days totalling 106.3mm. 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 July data.