Weather Alert
Decatur Weather Warning NWS WEATHER ALERT FOR THE DECATUR, IL AREA - Issued: 206 PM CDT Tue Aug 18 2026 Decatur Weather Warning

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Decatur, IL Weather Forecast

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Decatur, IL Weather Forecast

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Decatur IL weather - Clear - 73°F
Clear
73°F
Updated 10:53 pm
Feels Like 74°F
Humidity 81%
Wind SW 3 mph
Barometer  29.96 in
Dew Point 67°F
Decatur IL weather - Clear - 23°C
Clear
23°C
Updated 10:53 pm
Feels Like 24°C
Humidity 81%
Wind SW 5 km/h
Barometer  101.4 kPa
Dew Point 19°C
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Decatur Weather Forecast

REST OF TONIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY SATURDAY SUNDAY MONDAY TUESDAY
Decatur, IL Weather - Rest Of Tonight Chance Of Showers Decatur, IL Weather - Wednesday Chance Of T-Storm Decatur, IL Weather - Wednesday Night Chance Of T-Storm Decatur, IL Weather - Thursday Mostly Sunny Decatur, IL Weather - Thursday Night Mostly Clear Decatur, IL Weather - Friday Mostly Clear Decatur, IL Weather - Saturday Mostly Clear Decatur, IL Weather - Sunday Partly Cloudy Decatur, IL Weather - Monday Partly Cloudy Decatur, IL Weather - Tuesday Partly Cloudy
Chance of Showers Chance of T-Storm Chance of T-Storm Mostly Sunny Mostly Clear Mostly Clear Mostly Clear Partly Cloudy Partly Cloudy Partly Cloudy
Lo: 65°FLo: 18°C Hi: 79°FHi: 26°C
 Lo: 61°FLo: 16°C Hi: 80°FHi: 27°C
 Lo: 60°FLo: 16°C Hi: 81°FHi: 27°C
Lo: 61°FLo: 16°C		 Hi: 81°FHi: 27°C
Lo: 61°FLo: 16°C		 Hi: 81°FHi: 27°C
Lo: 61°FLo: 16°C		 Hi: 81°FHi: 27°C
Lo: 61°FLo: 16°C		 Hi: 81°FHi: 27°C
Lo: 61°FLo: 16°C
POP: 20% POP: 50% POP: 50%
POP = Probability of Precipitation.
Weather Outlook Updated: 938 PM CDT Tue Aug 18 2026 Decatur, IL Weather - WeatherWorld.com

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Decatur Forecast Discussion

Issued: 616 PM CDT Tue Aug 18 2026

Key Messages

  • While heavier rain with an overnight thunderstorm complex stays to our south, periods of showers and a few thunderstorms are expected late tonight into Wednesday morning.
  • A persistent northwest flow will keep temperatures and humidity levels in check the next several days, with highs in the upper 70s to lower 80s common.

Discussion

... Issued at 125 PM CDT Tue Aug 18 2026

A general northwest upper flow will prevail over the next several days, as a large low...