October in Florissant averages a daily high of 20.9°C with nights around 9.7°C. Expect roughly 8.3 wet days totalling 77.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Florissant is September–October.
Based on ST LOUIS LAMBERT INTERNATIONAL AIRPORT, MO US (6km), 1995–2024. 30 years of October data.