Current conditions at

Southern Illinois Airport (KMDH)

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

NA

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint NA
Visibility NA
Last update *** Not a current observation ***
Detailed forecast for

Union County

Overnight
Mostly cloudy with a chance of flurries. Cold. Near steady temperature around 10 above. North winds around 10 mph. Wind chill readings as low as 4 below.
Saturday
Mostly sunny. Highs around 20. Northwest winds 10 to 15 mph with gusts up to 25 mph. Wind chill readings as low as 3 below in the morning.
Saturday Night
Partly cloudy in the evening, then clearing. Cold with lows around 4 above. Northwest winds around 5 mph.
Sunday
Mostly sunny in the morning, then becoming mostly cloudy. Highs in the upper 20s. Southwest winds 5 to 10 mph.
Sunday Night
Mostly cloudy in the evening, then becoming partly cloudy. Not as cool with lows around 19. Southwest winds around 5 mph.
Monday
Mostly sunny. Highs in the upper 30s.
Monday Night
Mostly cloudy. Lows in the mid 20s.
Tuesday
Mostly cloudy. A chance of rain showers in the afternoon. Highs in the upper 30s. Chance of rain 40 percent.
Tuesday Night And Wednesday
Mostly cloudy. Lows in the lower 20s. Highs in the lower 30s.
Wednesday Night And Thursday
Partly cloudy. Lows 10 to 15. Highs in the lower 30s.
Thursday Night And Friday
Partly cloudy. Lows in the lower 20s. Highs in the mid 40s.



Basemap Options
Click map to change the forecast location
Loading map...
143 AM CST Sat Jan 31 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database