Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
St. Louis Weather in September
September in St. Louis brings high temperatures around 27°C (81°F) during the day, dropping to 16°C (61°F) at night, with quite a bit of rainfall expected, averaging around 105 mm (4.1 in) for the month.
Rainfall in St. Louis in September
Historically, the month has about 9 days of rain, averaging 105 mm (4.1 in) in total. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in St. Louis in September
Daytime highs in St. Louis in September reach 27°C (81°F), with nights around 16°C (61°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights cool down to 16°C (61°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in St. Louis in September
With approximately 235 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If your ideal day consists of dry skies and pleasant temperatures, October typically offers the best circumstances for St. Louis.
St. Louis Temperature in September
Min Temperature
16°C (61°F)
Max Temperature
27°C (81°F)
Chance of Rain
30%
Precipitation
105 mm (4.1 in)
Rainy days
9 days
Humidity
71%
Sunshine
235 hours
Percentage Sunshine
63%
St. Louis Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in St. Louis - and find the best time to visit.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in St. Louis in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in St. Louis in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
St. Louis 3-Day Forecast
More climate data for St. Louis
Temperature Rainfall Sunshine Humidity
See the full St. Louis climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
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Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
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