Current conditions at

Southern Illinois Airport (KMDH)

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

Fair

61°F

16°C

Humidity 88%
Wind Speed Calm
Barometer 30.15 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 3 Oct 8:52 pm CDT
Detailed forecast for

Union County

Tonight
Mostly cloudy. Lows in the mid 50s. Calm winds, becoming north around 5 mph after midnight.
Sunday
Mostly sunny. Highs in the upper 70s. North winds 5 to 10 mph.
Sunday Night
Mostly clear. Lows in the mid 50s. North winds around 5 mph.
Monday
Sunny. Highs in the mid 70s. Northeast winds 5 to 10 mph.
Monday Night
Clear. Lows in the upper 40s. Northeast winds around 5 mph.
Tuesday And Tuesday Night
Clear. Highs in the mid 70s. Lows in the upper 40s.
Wednesday
Sunny. Highs in the lower 80s.
Wednesday Night
Clear. Lows in the lower 50s.
Thursday
Sunny. Highs in the lower 80s.
Thursday Night And Friday
Clear. Lows in the lower 50s. Highs in the lower 80s.
Friday Night And Saturday
Mostly clear. Lows in the mid 50s. Highs in the mid 80s.



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947 PM CDT Sat Oct 3 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database