September in Fishers averages a daily high of 25.6°C with nights around 12.7°C. Expect roughly 7.5 wet days totalling 87.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Fishers is September–October.
Based on CARMEL 3 E, IN US (3.9km), 1995–2024. 23 years of September data.