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Caseyville IL Weather - Clear - 83°F
Clear
83°F
Updated 9:29 pm
Feels Like 81°F
Humidity 69%
Wind S 3 mph
Barometer  29.99 in
Dew Point 72°F
Caseyville IL Weather - Clear - 28°C
Clear
28°C
Updated 9:29 pm
Feels Like 27°C
Humidity 69%
Wind S 5 km/h
Barometer  101.6 kPa
Dew Point 22°C
Caseyville, IL Weather and Current Conditionscaseyville il weather forecast

Caseyville, IL Weather Forecast

Caseyville Illinois WeatherCaseyville, Illinois Weather Weather Forecast
14 day API weather forecast for Caseyville, Illinois. Note: The 7-day weather forecast for Caseyville, IL is the most reliable and accurate weather forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days ahead.
Caseyville, IL Weather Forecast Dated: 929 PM Wed Sep 09 2026
Expect a very warm period with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and no major pressure swings will dominate. Isolated storms at times.

Wednesday, September 9, 2026

Mid-Morning
Caseyville Weather - 2026-09-09 - Morning - Sunny
86°F 30°C
Sunny
Mid-Afternoon
Caseyville Weather - 2026-09-09 - Afternoon - Cloudy
95°F 35°C
Cloudy
Early-Evening
Caseyville Weather - 2026-09-09 - Evening - Scattered Showers
76°F 25°C
Scattered Showers
Sizzling hot near 95°F 35°C with a heat index reaching 102°F 39°C, periods of heavy rain and gusty conditions, with increasing humidity and steady pressure. A stray shower or storm late in the day. Winds easing from SW 13 mph 20 km/h to ESE 4 mph 6 km/h.

Thursday, September 10, 2026

Mid-Morning
Caseyville Weather - 2026-09-10 - Morning - Light Showers
71°F 22°C
Light Showers
Mid-Afternoon
Caseyville Weather - 2026-09-10 - Afternoon - Light Showers
71°F 22°C
Light Showers
Early-Evening
Caseyville Weather - 2026-09-10 - Evening - Scattered Showers
72°F 22°C
Scattered Showers
Comfortable with temperatures reaching 71°F 22°C, scattered downpours possible, with steady humidity and steady pressure.

Friday, September 11, 2026

Mid-Morning
Caseyville Weather - 2026-09-11 - Morning - Overcast
69°F 21°C
Overcast
Mid-Afternoon
Caseyville Weather - 2026-09-11 - Afternoon - Overcast
80°F 27°C
Overcast
Early-Evening
Caseyville Weather - 2026-09-11 - Evening - Overcast
77°F 25°C
Overcast
Quite warm around 80°F 27°C, overcast throughout the day, with lower humidity and barometric pressure falling.

Saturday, September 12, 2026

Mid-Morning
Caseyville Weather - 2026-09-12 - Morning - Sunny
75°F 24°C
Sunny
Mid-Afternoon
Caseyville Weather - 2026-09-12 - Afternoon - Scattered Showers
88°F 31°C
Scattered Showers
Early-Evening
Caseyville Weather - 2026-09-12 - Evening - Scattered Showers
80°F 27°C
Scattered Showers
Warm and summery around 88°F 31°C (feels like 91°F 33°C), periods of heavy rain and gusty conditions, with steady humidity and steady pressure.

Sunday, September 13, 2026

Mid-Morning
Caseyville Weather - 2026-09-13 - Morning - Overcast
76°F 24°C
Overcast
Mid-Afternoon
Caseyville Weather - 2026-09-13 - Afternoon - Partly Cloudy
91°F 33°C
Partly Cloudy
Early-Evening
Caseyville Weather - 2026-09-13 - Evening - Overcast
86°F 30°C
Overcast
Hot and sweltering around 91°F 33°C (heat index 94°F 35°C), overcast in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure.

Monday, September 14, 2026

Mid-Morning
Caseyville Weather - 2026-09-14 - Morning - Partly Cloudy
80°F 27°C
Partly Cloudy
Mid-Afternoon
Caseyville Weather - 2026-09-14 - Afternoon - Sunny
98°F 37°C
Sunny
Early-Evening
Caseyville Weather - 2026-09-14 - Evening - Sunny
92°F 33°C
Sunny
Very hot with temperatures reaching 98°F 37°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds switching from the S to the SSW at 8 mph 14 km/h.

Tuesday, September 15, 2026

Mid-Morning
Caseyville Weather - 2026-09-15 - Morning - Scattered Showers
77°F 25°C
Scattered Showers
Mid-Afternoon
Caseyville Weather - 2026-09-15 - Afternoon - Sunny
88°F 31°C
Sunny
Early-Evening
Caseyville Weather - 2026-09-15 - Evening - Partly Cloudy
77°F 25°C
Partly Cloudy
Warm and summery around 88°F 31°C (feels like 92°F 33°C), periods of heavy rain and gusty conditions, with lower humidity and steady pressure. A stray shower or storm late in the day. Winds moving from the WNW to the NNE at 10 mph 16 km/h.

Wednesday, September 16, 2026

Mid-Morning
Caseyville Weather - 2026-09-16 - Morning - Partly Cloudy
68°F 20°C
Partly Cloudy
Mid-Afternoon
Caseyville Weather - 2026-09-16 - Afternoon - Partly Cloudy
83°F 28°C
Partly Cloudy
Early-Evening
Caseyville Weather - 2026-09-16 - Evening - Overcast
78°F 26°C
Overcast
Quite warm around 83°F 28°C, cloudy through the afternoon, turning overcast this evening, with steady humidity and steady pressure.

Thursday, September 17, 2026

Mid-Morning
Caseyville Weather - 2026-09-17 - Morning - Partly Cloudy
72°F 22°C
Partly Cloudy
Mid-Afternoon
Caseyville Weather - 2026-09-17 - Afternoon - Light Showers
73°F 23°C
Light Showers
Early-Evening
Caseyville Weather - 2026-09-17 - Evening - Overcast
71°F 22°C
Overcast
Mild temperatures up to 73°F 23°C, dry early, with showers developing in the afternoon, with increasing humidity and steady pressure.

Friday, September 18, 2026

Mid-Morning
Caseyville Weather - 2026-09-18 - Morning - Light Fog
70°F 21°C
Light Fog
Mid-Afternoon
Caseyville Weather - 2026-09-18 - Afternoon - Scattered Showers
86°F 30°C
Scattered Showers
Early-Evening
Caseyville Weather - 2026-09-18 - Evening - Sunny
83°F 28°C
Sunny
Warm and summery around 86°F 30°C (feels like 89°F 32°C), periods of heavy rain and gusty conditions, with lower humidity and barometric pressure falling.

Saturday, September 19, 2026

Mid-Morning
Caseyville Weather - 2026-09-19 - Morning - Partly Cloudy
84°F 29°C
Partly Cloudy
Mid-Afternoon
Caseyville Weather - 2026-09-19 - Afternoon - Partly Cloudy
102°F 39°C
Partly Cloudy
Early-Evening
Caseyville Weather - 2026-09-19 - Evening - Sunny
92°F 34°C
Sunny
Dangerously hot temperatures around 102°F 39°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure falling. Winds swinging from the SW to the NW at 8 mph 13 km/h.

Sunday, September 20, 2026

Mid-Morning
Caseyville Weather - 2026-09-20 - Morning - Sunny
79°F 26°C
Sunny
Mid-Afternoon
Caseyville Weather - 2026-09-20 - Afternoon - Sunny
93°F 34°C
Sunny
Early-Evening
Caseyville Weather - 2026-09-20 - Evening - Sunny
87°F 31°C
Sunny
Very hot with a high of 93°F 34°C, feeling closer to 96°F 35°C in the humidity, sunny through the afternoon, turning cloudy this evening, with steady humidity and steady pressure.

Monday, September 21, 2026

Mid-Morning
Caseyville Weather - 2026-09-21 - Morning - Overcast
75°F 24°C
Overcast
Mid-Afternoon
Caseyville Weather - 2026-09-21 - Afternoon - Overcast
82°F 28°C
Overcast
Early-Evening
Caseyville Weather - 2026-09-21 - Evening - Light Showers
77°F 25°C
Light Showers
Warm and summery around 82°F 28°C (feels like 85°F 30°C), drier conditions through late afternoon before showers move in, with steady humidity and steady pressure. Winds shifting from the NE to the NW at 6 mph 9 km/h.

Tuesday, September 22, 2026

Mid-Morning
Caseyville Weather - 2026-09-22 - Morning - Fog
71°F 22°C
Fog
Mid-Afternoon
Caseyville Weather - 2026-09-22 - Afternoon - Scattered Showers
79°F 26°C
Scattered Showers
Early-Evening
Caseyville Weather - 2026-09-22 - Evening - Scattered Showers
77°F 25°C
Scattered Showers
Mild temperatures up to 79°F 26°C, scattered downpours possible, with lower humidity and steady pressure. Winds turning from the NNW to the NW at 5 mph 7 km/h.

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Weather by the Numbers

Wed, 9th
Caseyville IL Weather - Wednesday, Sep 9, 2026 - Overcast
Hi: 101°F 38°C
Lo: 74°F 23°C
Sunrise 06:36 AM
Sunset 07:18 PM
Wind WNW 7 mph11 km/h
Dew Point 64°F18°C
uv Index 7
Barometric Pressure 30 in1016 mb
POP 9% *
Humidity 41%
Thu, 10th
Caseyville IL Weather - Thursday, Sep 10, 2026 - Moderate Or Heavy Rain Shower
Hi: 74°F 23°C
Lo: 69°F 21°C
Sunrise 06:37 AM
Sunset 07:16 PM
Wind NW 10 mph16 km/h
Dew Point 70°F21°C
uv Index 0
Barometric Pressure 30.03 in1017 mb
POP 87% *
Humidity 96%
Fri, 11th
Caseyville IL Weather - Friday, Sep 11, 2026 - Overcast
Hi: 82°F 28°C
Lo: 67°F 19°C
Sunrise 06:38 AM
Sunset 07:15 PM
Wind SE 6 mph9 km/h
Dew Point 64°F18°C
uv Index 6
Barometric Pressure 29.97 in1015 mb
POP 17% *
Humidity 67%
Sat, 12th
Caseyville IL Weather - Saturday, Sep 12, 2026 - Sunny
Hi: 88°F 31°C
Lo: 69°F 20°C
Sunrise 06:39 AM
Sunset 07:13 PM
Wind S 6 mph10 km/h
Dew Point 67°F19°C
uv Index 7
Barometric Pressure 29.91 in1013 mb
POP 3% *
Humidity 56%
Sun, 13th
Caseyville IL Weather - Sunday, Sep 13, 2026 - Sunny
Hi: 91°F 33°C
Lo: 71°F 22°C
Sunrise 06:40 AM
Sunset 07:11 PM
Wind SE 5 mph8 km/h
Dew Point 66°F19°C
uv Index 8
Barometric Pressure 30 in1016 mb
POP 2% *
Humidity 52%
Mon, 14th
Caseyville IL Weather - Monday, Sep 14, 2026 - Partly Cloudy
Hi: 99°F 37°C
Lo: 75°F 24°C
Sunrise 06:40 AM
Sunset 07:10 PM
Wind SW 11 mph17 km/h
Dew Point 65°F18°C
uv Index 8
Barometric Pressure 29.94 in1014 mb
POP 2% *
Humidity 43%
Tue, 15th
Caseyville IL Weather - Tuesday, Sep 15, 2026 - Overcast
Hi: 88°F 31°C
Lo: 70°F 21°C
Sunrise 06:41 AM
Sunset 07:08 PM
Wind ESE 9 mph14 km/h
Dew Point 70°F21°C
uv Index 6
Barometric Pressure 30.09 in1019 mb
POP 7% *
Humidity 64%
Wed, 16th
Caseyville IL Weather - Wednesday, Sep 16, 2026 - Cloudy
Hi: 83°F 28°C
Lo: 66°F 19°C
Sunrise 06:42 AM
Sunset 07:06 PM
Wind NE 3 mph5 km/h
Dew Point 62°F17°C
uv Index 6
Barometric Pressure 30.27 in1025 mb
POP 6% *
Humidity 60%
Thu, 17th
Caseyville IL Weather - Thursday, Sep 17, 2026 - Patchy Rain Nearby
Hi: 75°F 24°C
Lo: 67°F 20°C
Sunrise 06:43 AM
Sunset 07:05 PM
Wind NE 9 mph15 km/h
Dew Point 62°F17°C
uv Index 5
Barometric Pressure 30.24 in1024 mb
POP 51% *
Humidity 65%
Fri, 18th
Caseyville IL Weather - Friday, Sep 18, 2026 - Patchy Rain Nearby
Hi: 87°F 31°C
Lo: 65°F 18°C
Sunrise 06:44 AM
Sunset 07:03 PM
Wind S 4 mph7 km/h
Dew Point 65°F18°C
uv Index 6
Barometric Pressure 30.15 in1021 mb
POP 18% *
Humidity 61%
Sat, 19th
Caseyville IL Weather - Saturday, Sep 19, 2026 - Sunny
Hi: 103°F 39°C
Lo: 75°F 24°C
Sunrise 06:45 AM
Sunset 07:02 PM
Wind WSW 17 mph27 km/h
Dew Point 63°F17°C
uv Index 9
Barometric Pressure 29.8 in1009 mb
POP 2% *
Humidity 35%
Sun, 20th
Caseyville IL Weather - Sunday, Sep 20, 2026 - Sunny
Hi: 94°F 35°C
Lo: 73°F 23°C
Sunrise 06:46 AM
Sunset 07:00 PM
Wind NNW 6 mph10 km/h
Dew Point 62°F17°C
uv Index 8
Barometric Pressure 29.83 in1010 mb
POP 1% *
Humidity 43%
Mon, 21st
Caseyville IL Weather - Monday, Sep 21, 2026 - Patchy Rain Nearby
Hi: 86°F 30°C
Lo: 72°F 22°C
Sunrise 06:47 AM
Sunset 06:58 PM
Wind ENE 7 mph12 km/h
Dew Point 67°F19°C
uv Index 6
Barometric Pressure 29.88 in1012 mb
POP 14% *
Humidity 60%
Tue, 22nd
Caseyville IL Weather - Tuesday, Sep 22, 2026 - Overcast
Hi: 81°F 27°C
Lo: 67°F 20°C
Sunrise 06:48 AM
Sunset 06:57 PM
Wind NW 5 mph8 km/h
Dew Point 65°F18°C
uv Index 5
Barometric Pressure 29.91 in1013 mb
POP 18% *
Humidity 70%
* POP = Probability of Precipitation. Data for 12:00 PM.