September in Fargo averages a daily high of 22.8°C with nights around 9.7°C. Expect roughly 8.4 wet days totalling 67.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Fargo is May–September.
Based on FARGO HECTOR INTERNATIONAL AIRPORT, ND US (5.5km), 1995–2024. 30 years of September data.