St. Mary, IL Weather Forecast

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St. Mary, IL Weather Forecast

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St. Mary IL weather  - Clear - 53°F
Clear
53°F
Updated 2:20 am
Feels Like 58°F
Humidity 81%
Wind N 0 mph
Barometer  30.35 in
Dew Point 47°F
St. Mary IL weather  - Clear - 12°C
Clear
12°C
Updated 2:20 am
Feels Like 15°C
Humidity 81%
Wind N 0 km/h
Barometer  102.7 kPa
Dew Point 9°C

St. Mary Weather Forecast

REST OF TONIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY
St. Mary, IL Weather - Rest Of Tonight Cloudy St. Mary, IL Weather - Monday Mostly Cloudy St. Mary, IL Weather - Monday Night Partly Cloudy St. Mary, IL Weather - Tuesday Mostly Cloudy St. Mary, IL Weather - Tuesday Night Mostly Cloudy St. Mary, IL Weather - Wednesday Partly Sunny St. Mary, IL Weather - Wednesday Night Partly Cloudy St. Mary, IL Weather - Thursday Chance Of Showers St. Mary, IL Weather - Thursday Night Partly Cloudy St. Mary, IL Weather - Friday Chance Of Showers St. Mary, IL Weather - Friday Night Chance Of Showers St. Mary, IL Weather - Saturday Chance Of Showers
Cloudy Mostly Cloudy Partly Cloudy Mostly Cloudy Mostly Cloudy Partly Sunny Partly Cloudy Chance of Showers Partly Cloudy Chance of Showers Chance of Showers Chance of Showers
Lo: 55°FLo: 13°C Hi: 75°FHi: 24°C
Lo: 51°FLo: 11°C Hi: 75°FHi: 24°C
Lo: 55°FLo: 13°C Hi: 75°FHi: 24°C
Lo: 59°FLo: 15°C Hi: 79°FHi: 26°C
Lo: 59°FLo: 15°C Hi: 79°FHi: 26°C
Lo: 59°FLo: 15°C Hi: 71°FHi: 22°C
Lo: 55°FLo: 13°C
POP: 30% POP: 30% POP: 30% POP: 40%
POP = Probability of Precipitation.
Weather Outlook Updated: 126 AM CDT Mon Oct 26 2026 St. Mary, IL Weather - WeatherWorld.com

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Issued: 1242 AM CDT Mon Oct 26 2026

Key Messages

  • Unseasonably mild fall weather continues through the end of the week with passing clouds and relatively light winds.
  • Mostly dry conditions expected for the beginning of the week with chances gradually increasing midweek and into the weekend.

Aviation

/06Z TAFS THROUGH 06Z TUESDAY/... Issued at 1242 AM CDT Mon Oct 26 2026

VFR conditions are expected to prevail for another 24 hours. As a weak boundary moves southward through the morning hours, winds will shift easterly and pick up to 6-12...