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Cast, IL Weather Forecast

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Cast IL weather - Clear - 71°F
Clear
71°F
Updated 2:31 pm
Feels Like 65°F
Humidity 27%
Wind N 0 mph
Barometer  30.33 in
Dew Point 36°F
Cast IL weather - Clear - 22°C
Clear
22°C
Updated 2:31 pm
Feels Like 19°C
Humidity 27%
Wind N 0 km/h
Barometer  102.7 kPa
Dew Point 2°C
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Cast Weather Forecast

THIS AFTERNOON TONIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SUNDAY SUNDAY NIGHT MONDAY
Cast, IL Weather - This Afternoon Sunny Cast, IL Weather - Tonight Clear Cast, IL Weather - Wednesday Sunny Cast, IL Weather - Wednesday Night Clear Cast, IL Weather - Thursday Sunny Cast, IL Weather - Thursday Night Clear Cast, IL Weather - Friday Mostly Clear Cast, IL Weather - Friday Night Mostly Clear Cast, IL Weather - Saturday Partly Cloudy Cast, IL Weather - Sunday Partly Cloudy Cast, IL Weather - Sunday Night Mostly Cloudy Cast, IL Weather - Monday Mostly Cloudy
Sunny Clear Sunny Clear Sunny Clear Mostly Clear Mostly Clear Partly Cloudy Partly Cloudy Mostly Cloudy Mostly Cloudy
Hi: 70°FHi: 21°C
 Lo: 41°FLo: 5°C Hi: 71°FHi: 22°C
 Lo: 45°FLo: 7°C Hi: 75°FHi: 24°C
 Lo: 45°FLo: 7°C Hi: 71°FHi: 22°C
Lo: 45°FLo: 7°C		 Hi: 71°FHi: 22°C
Lo: 45°FLo: 7°C		 Hi: 75°FHi: 24°C
Lo: 49°FLo: 9°C		 Hi: 75°FHi: 24°C
Lo: 49°FLo: 9°C		 Hi: 71°FHi: 22°C
Lo: 49°FLo: 9°C		 Hi: 71°FHi: 22°C
Lo: 49°FLo: 9°C
POP = Probability of Precipitation.
Weather Outlook Updated: 127 PM CDT Tue Oct 20 2026 Cast, IL Weather - WeatherWorld.com

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Issued: 1233 PM CDT Tue Oct 20 2026

Key Messages

  • Dry conditions and tranquil weather prevail across central and southeast Illinois through this weekend.
  • Above normal temperatures will dominate the region, with afternoon highs climbing into the mid to upper 70s.

Discussion

... Issued at 1233 PM CDT Tue Oct 20 2026

Expansive surface high pressure centered south of James Bay extends southwest into the mid and lower Mississippi Valley this afternoon. Broad subsidence and very dry air below 500 mb will lead to clear skies through tonight. ...