Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78° N Lon: 89.25° W Elev: 400 ft.

Fair

74°F

23°C

Humidity 60%
Wind Speed S 10 mph
Barometer 29.88 in (1011.7 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 15 Apr 7:52 pm CDT
Detailed forecast for

Union County

Tonight
Mostly cloudy. A slight chance of showers and thunderstorms this evening, then showers likely with a chance of thunderstorms after midnight. Lows in the lower 60s. Southwest winds 5 to 10 mph. Gusts up to 25 mph this evening. Chance of rain 70 percent.
Thursday
Mostly cloudy in the morning, then becoming mostly sunny. A chance of showers. A chance of thunderstorms, mainly in the morning. Highs around 80. Southwest winds 5 to 10 mph. Chance of rain 50 percent.
Thursday Night
Mostly clear. A chance of showers in the evening. Lows in the upper 50s. South winds around 5 mph. Chance of rain 30 percent.
Friday
Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. South winds 10 to 15 mph. Chance of rain 30 percent.
Friday Night
Mostly cloudy. A chance of showers and thunderstorms after midnight. Lows around 60. South winds 10 to 15 mph. Chance of rain 50 percent.
Saturday
A chance of thunderstorms in the morning. Showers likely. Cooler with highs around 70. Chance of rain 70 percent.
Saturday Night
Mostly cloudy in the evening, then clearing. Cooler with lows in the lower 40s.
Sunday Through Monday
Clear. Highs in the upper 60s. Lows in the lower 40s.
Monday Night
Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s.
Tuesday
Mostly sunny. Highs in the mid 70s.
Tuesday Night
Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 50s.
Wednesday
Mostly sunny. Highs in the upper 70s.



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638 PM CDT Wed Apr 15 2026
 
 

Additional Resources

Radar & Satellite Image

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National Digital Forecast Database