July in Bismarck averages a daily high of 29.8°C with nights around 15°C. Expect roughly 9 wet days totalling 70.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Bismarck is May.
Based on BISMARCK MUNICIPAL AIRPORT, ND US (4.5km), 1995–2024. 30 years of July data.