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Decatur, IL Weather Forecast

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Decatur, IL Weather Forecast

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Decatur IL weather - Clear - 49°F
Clear
49°F
Updated 1:27 am
Feels Like 52°F
Humidity 89%
Wind N 0 mph
Barometer  30.17 in
Dew Point 46°F
Decatur IL weather - Clear - 9°C
Clear
9°C
Updated 1:27 am
Feels Like 11°C
Humidity 89%
Wind N 0 km/h
Barometer  102.1 kPa
Dew Point 8°C
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Decatur Weather Forecast

REST OF TONIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY THURSDAY FRIDAY SATURDAY
Decatur, IL Weather - Rest Of Tonight Mostly Clear Decatur, IL Weather - Sunday Sunny Decatur, IL Weather - Sunday Night Mostly Clear Decatur, IL Weather - Monday Sunny Decatur, IL Weather - Monday Night Clear Decatur, IL Weather - Tuesday Clear Decatur, IL Weather - Tuesday Night Clear Decatur, IL Weather - Wednesday Mostly Clear Decatur, IL Weather - Thursday Mostly Clear Decatur, IL Weather - Friday Clear Decatur, IL Weather - Saturday Clear
Mostly Clear Sunny Mostly Clear Sunny Clear Clear Clear Mostly Clear Mostly Clear Clear Clear
Lo: 45°FLo: 7°C Hi: 79°FHi: 26°C
 Lo: 49°FLo: 9°C Hi: 71°FHi: 22°C
 Lo: 41°FLo: 5°C Hi: 75°FHi: 24°C
Lo: 50°FLo: 10°C		 Hi: 75°FHi: 24°C
Lo: 50°FLo: 10°C		 Hi: 81°FHi: 27°C
Lo: 51°FLo: 11°C		 Hi: 81°FHi: 27°C
Lo: 51°FLo: 11°C		 Hi: 81°FHi: 27°C
Lo: 55°FLo: 13°C		 Hi: 81°FHi: 27°C
Lo: 55°FLo: 13°C
POP = Probability of Precipitation.
Weather Outlook Updated: 1237 AM CDT Sun Oct 04 2026 Decatur, IL Weather - WeatherWorld.com

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Issued: 608 PM CDT Sat Oct 3 2026

Key Messages

  • Near to slightly above average temperatures along with dry conditions will dominate central Illinois through the rest of the weekend and into early next week.

Discussion

... Issued at 135 PM CDT Sat Oct 3 2026

The latest surface analysis has a high over Michigan and frontal boundary stationary extending southwest from the mid Atlantic through the Southeast to Texas. An upper level wave will pass through the Dakotas today and through MN/WI/MI tonight. The southern extent of precipitation...