Caseyville Weather in September

Caseyville in September sees high temperatures, with highs around 27°C (81°F) and overnight lows of 15°C (59°F). Rainfall is fairly high at around 98 mm (3.9 in) on average, so pack waterproofs just in case.

Rainfall in Caseyville in September

Climate statistics over the past 30 years suggest around 9 days of rain, with 98 mm (3.9 in) average for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Caseyville in September

The temperature in Caseyville in September is perfect. Daytime highs reach 27°C (81°F), with nights dropping to 15°C (59°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights drop to around 15°C (59°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Caseyville in September

The month enjoys around 235 hours of sunshine, creating mostly sunny days with good weather conditions.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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• January
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• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Caseyville's climate page.

Caseyville Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 27°C (81°F)  

Chance of Rain 31%  

Precipitation 98 mm (3.9 in)  

Rainy days 9 days  

Humidity 71% *  

Sunshine 235 hours *  

Percentage Sunshine 63% *  

* Data from: St. Louis, the United States of America (14 KM, 9 Miles).

What to Wear in Caseyville in September

Warm but pleasant conditions in Caseyville in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Caseyville in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

8/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Caseyville's climate page.

More climate data for Caseyville

Temperature Rainfall Sunshine Humidity

See the full Caseyville climate overview or explore weather in the United States of America.