March in Florissant averages a daily high of 14°C with nights around 3°C. Expect roughly 10.8 wet days totalling 93.9mm. Generally workable, with some weather to plan around.
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 March data.