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Williamson, IL Weather Forecast

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Williamson, IL Weather Forecast

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Williamson IL weather - Clear - 50°F
Clear
50°F
Updated 2:15 am
Feels Like 52°F
Humidity 90%
Wind N 0 mph
Barometer  30.25 in
Dew Point 48°F
Williamson IL weather - Clear - 10°C
Clear
10°C
Updated 2:15 am
Feels Like 11°C
Humidity 90%
Wind N 0 km/h
Barometer  102.4 kPa
Dew Point 9°C
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Williamson Weather Forecast

REST OF TONIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY
Williamson, IL Weather - Rest Of Tonight Patchy Fog Williamson, IL Weather - Tuesday Mostly Cloudy Williamson, IL Weather - Tuesday Night Partly Cloudy Williamson, IL Weather - Wednesday Sunny Williamson, IL Weather - Wednesday Night Clear Williamson, IL Weather - Thursday Sunny Williamson, IL Weather - Thursday Night Partly Cloudy Williamson, IL Weather - Friday Mostly Cloudy Williamson, IL Weather - Friday Night Mostly Cloudy Williamson, IL Weather - Saturday Chance Of Showers Williamson, IL Weather - Saturday Night Showers Likely Williamson, IL Weather - Sunday Chance Of Showers
Patchy Fog Mostly Cloudy Partly Cloudy Sunny Clear Sunny Partly Cloudy Mostly Cloudy Mostly Cloudy Chance of Showers Showers Likely Chance of Showers
Lo: 50°FLo: 10°C Hi: 75°FHi: 24°C
 Lo: 51°FLo: 11°C Hi: 80°FHi: 27°C
 Lo: 55°FLo: 13°C Hi: 81°FHi: 27°C
 Lo: 55°FLo: 13°C Hi: 80°FHi: 27°C
Lo: 59°FLo: 15°C		 Hi: 80°FHi: 27°C
Lo: 59°FLo: 15°C		 Hi: 75°FHi: 24°C
 Lo: 55°FLo: 13°C Hi: 75°FHi: 24°C
POP: 40% POP: 60% POP: 20%
POP = Probability of Precipitation.
Weather Outlook Updated: 128 AM CDT Tue Oct 27 2026 Williamson, IL Weather - WeatherWorld.com

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Issued: 1046 PM CDT Mon Oct 26 2026

Key Messages

  • Warm and mostly dry weather is forecast through the end of the week.
  • There is a 30-50% chance of light rain this weekend. Widespread rainfall is not expected.

Aviation

/00Z TAFS THROUGH 06Z WEDNESDAY/... Issued at 1036 PM CDT Mon Oct 26 2026

Recent observation trends at KSUS suggest fog development, as low as IFR at times, is more likely again tonight. Conversely, conditions at KJEF are trending drier than previously forecast. As a result, conditions were degraded at KSUS in this TAF is...