April in Bismarck averages a daily high of 13°C with nights around -1°C. Expect roughly 8.5 wet days totalling 36.2mm. 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 April data.