Typical Weather in St Louis, MO in September
81° F Avg High
61° F Avg Low
5 Rainy Days
☀️ Temperature Summary
September is a popular time to visit, with an inviting climate featuring warm temperatures. September is one of the warmer months of the year for St Louis, with highs averaging around 81°F. You can expect overnight lows near 61°F most days. Temperatures will usually fall as the month goes on, with daily high temperatures ranging between 84°F and 75°F.
September is a great time to visit St Louis, with mild temperatures and sunny days being very common.
High Temps Throughout the Year
🎒 What to Pack
Pick up a few of these items to keep your trip fun and comfortable.
☔ Rain Summary
In September you can expect close to a 17% chance of rain for any given day. It rains less than usual in September, with total rainfall for the month typically near 4 inches.
Rainfall Throughout the Year
Planning a trip to St Louis? Try our free trip weather planner