August in Grand Forks averages a daily high of 26.4°C with nights around 13.9°C. Expect roughly 9.1 wet days totalling 76.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Grand Forks is May–September.
Based on GRAND FORKS UNIVERSITY NWS, ND US (4.8km), 1995–2024. 30 years of August data.