Weather · Saint Louis, United States
Saint Louis Weather in September
September in Saint Louis averages 23°C by day and 13°C at night, with about 66mm of rain. That makes it one of the best months to visit.
Avg high
23°C
73°F
Avg low
13°C
55°F
Rainfall
66mm
#7 wettest of 12
What to pack
Summer clothes by day; a light layer for evenings. Rain is unlikely to interrupt your plans.
Timing a trip around the weather? A Local Friend in Saint Louis builds it around the season for you.