Month guide · St. Louis · United States
St. Louis in September
What September is really like in St. Louis: weather, crowds, prices, events and what to pack.
Updated By the AMZBooking editorial team
Photo: Kitz000 - Matt Kitces, CC BY-SA 3.0
Quick answer
September is one of the best months to visit St. Louis. Expect average highs of 27°C (81°F), lows of 16°C (61°F), about 8 rainy days and roughly 12.4 hours of daylight. Warm and less humid, with some of the year's best festivals.
Key facts
- Average high / low
- 27°C (81°F) / 16°C (61°F)
- Rainy days
- About 8
- Daylight
- About 12.4 hours
- Crowds
- Moderate
- Hotel prices
- Average
Weather in September
September is the 4th-warmest month in St. Louis: days average 27°C (81°F) against a yearly average high of 19°C (66°F), and nights fall to about 16°C (61°F). Rain falls on roughly 8 of its 30 days. Compared with August (31°C (88°F)), September is cooler; by October highs drop to around 20°C (68°F).
- Sunrise (15 September)
- About 06:42
- Sunset (15 September)
- About 19:10
- Daylight
- About 12.4 hours
Autumn (September–November). Pleasant September and October weather, festivals, autumn colour and the start of hockey season.
Crowds and prices
On a 1–5 scale, September rates 3 for crowds (the peak is June at 4) and 3 for hotel prices (highest in June). Prices sit in the middle of the year's range.
Events in September
- Japanese Festival at the Missouri Botanical Garden (usually Labor Day weekend)
- Great Forest Park Balloon Race (usually September)
- St. Louis Art Fair in Clayton (usually September)
Dates move from year to year. Check the organiser’s site before booking travel around an event.
What to do in September
Mild, settled days suit walking, viewpoints and time outdoors.
Garden · Shaw
Missouri Botanical Garden
Walk the Japanese garden in the morning light, and visit in late spring for the azaleas and irises or in winter for the Garden Glow lights.
- Time needed
- 2–3 hours
- Cost
- Low cost
- Nature
- Couples
- Photo spot
- Outdoors
Park · Sunset Hills
Laumeier Sculpture Park
In the southwestern suburbs, this free open-air museum spreads around 60 large-scale works across about 40 hectares of lawns and woods, including Alexander Liberman's huge red steel sculpture The Way.
- Time needed
- 1.5–2 hours
- Cost
- Free
- Free
- Art
- Outdoors
- Kids
Park · Downtown
Citygarden
In summer, bring swimwear for children to play in the splash fountains.
- Time needed
- 30–45 minutes
- Cost
- Free
- Free
- Art
- Kids
- Outdoors
Landmark · North St. Louis
Chain of Rocks Bridge
Opened in 1929 and once part of Route 66, this 1.6-km bridge over the Mississippi has an unusual 22-degree bend in the middle.
- Time needed
- 1–2 hours
- Cost
- Free
- Free
- History
- Outdoors
- Views
- Off the beaten path
What to pack
For highs near 27°C, lows near 16°C and 8 wet days: light layers for the day and a light jacket for the evening; a packable rain jacket for showers; comfortable walking shoes.
Is September a good time to visit St. Louis?
One of the best months to visit St. Louis, with 3 notable events on the calendar. The other best months are April–May and October. Compare every month.
St. Louis in other months
Questions travellers ask
+Is September a good time to visit St. Louis?
It is one of the best months to visit St. Louis. Warm and less humid, with some of the year's best festivals.
+How warm is St. Louis in September?
Average highs are around 27°C (81°F) and lows around 16°C (61°F).
+Does it rain a lot in St. Louis in September?
Expect rain on about 8 days of the month.