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Caseyville Weather Warning NWS WEATHER ALERT FOR THE CASEYVILLE, IL AREA - Issued: 251 AM CDT Wed Sep 16 2026 Caseyville Weather Warning

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Caseyville, IL Weather Forecast

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Caseyville, IL Weather Forecast

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Caseyville IL weather - Clear - 76°F
Clear
76°F
Updated 8:25 am
Feels Like 80°F
Humidity 87%
Wind ENE 3 mph
Barometer  30.23 in
Dew Point 72°F
Caseyville IL weather - Clear - 24°C
Clear
24°C
Updated 8:25 am
Feels Like 26°C
Humidity 87%
Wind ENE 5 km/h
Barometer  102.4 kPa
Dew Point 22°C
WX Settings

Caseyville Weather Forecast

TODAY TONIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT
Caseyville, IL Weather - Today Chance Of T-Storm Caseyville, IL Weather - Tonight Chance Of T-Storm Caseyville, IL Weather - Thursday Sunny Caseyville, IL Weather - Thursday Night Partly Cloudy Caseyville, IL Weather - Friday Mostly Sunny Caseyville, IL Weather - Friday Night Partly Cloudy Caseyville, IL Weather - Saturday Mostly Sunny Caseyville, IL Weather - Saturday Night Chance Of T-Storm Caseyville, IL Weather - Sunday Chance Of T-Storm Caseyville, IL Weather - Sunday Night Chance Of T-Storm Caseyville, IL Weather - Monday Chance Of T-Storm Caseyville, IL Weather - Monday Night Chance Of Showers
Chance of T-Storm Chance of T-Storm Sunny Partly Cloudy Mostly Sunny Partly Cloudy Mostly Sunny Chance of T-Storm Chance of T-Storm Chance of T-Storm Chance of T-Storm Chance of Showers
Hi: 95°FHi: 35°C
 Lo: 75°FLo: 24°C Hi: 99°FHi: 37°C
 Lo: 71°FLo: 22°C Hi: 95°FHi: 35°C
 Lo: 71°FLo: 22°C Hi: 99°FHi: 37°C
 Lo: 71°FLo: 22°C Hi: 91°FHi: 33°C
 Lo: 69°FLo: 21°C Hi: 85°FHi: 29°C
 Lo: 65°FLo: 18°C
POP: 40% POP: 30% POP: 40% POP: 20% POP: 40% POP: 20% POP: 30%
POP = Probability of Precipitation.
Weather Outlook Updated: 607 AM CDT Wed Sep 16 2026 Caseyville, IL Weather - WeatherWorld.com

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Issued: 654 AM CDT Wed Sep 16 2026

Key Messages

  • A late season heat wave continues through at least Friday with peak heat index values of 100-105F+ along/south of I-70.
  • Widespread showers and thunderstorms will be limited to northeast MO/west-central IL through this morning with scattered showers and sub-severe thunderstorms possible (20-30%) across the area this afternoon/evening.

Aviation

/12Z TAFS THROUGH 18Z THURSDAY/... Issued at 654 AM CDT Wed Sep 16 2026

A weak cold front has slowly moved south of all local terminals and is now...