July in Hammond averages a daily high of 28.9°C with nights around 18°C. Expect roughly 9.1 wet days totalling 123.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Hammond is August–September.
Based on PARK FOREST WATER, IL US (17.9km), 1995–2024. 29 years of July data.