Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89° N Lon: 90.03° W Elev: 518 ft.

Fair

54°F

12°C

Humidity 28%
Wind Speed S 12 mph
Barometer 30.12 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 12 Mar 4:45 pm CDT
Detailed forecast for

Macoupin County

This Afternoon
Mostly sunny. Highs in the lower 50s. Southwest winds 10 to 15 mph.
Tonight
Partly cloudy and breezy. Not as cool with lows in the lower 40s. Southwest winds 15 to 25 mph with gusts up to 40 mph.
Friday
Mostly sunny and breezy. Highs in the mid 50s. West winds 15 to 25 mph with gusts up to 35 mph.
Friday Night
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 30s. Northwest winds 5 to 10 mph with gusts up to 20 mph, becoming northeast after midnight.
Saturday
Partly sunny. Highs in the lower 60s. Southeast winds 10 to 15 mph.
Saturday Night
Mostly cloudy. A slight chance of rain after midnight. Not as cool with lows in the lower 50s. Chance of rain 20 percent.
Sunday
Rain likely with a slight chance of thunderstorms in the morning, then rain with a chance of thunderstorms in the afternoon. Breezy with highs in the mid 60s. Chance of rain near 100 percent.
Sunday Night
Rain, snow with a slight chance of thunderstorms in the evening, then a chance of snow after midnight. Light snow accumulation. Windy and much cooler with lows around 20. Chance of precipitation near 100 percent. Wind chill values as low as zero after midnight.
Monday
Mostly cloudy with a slight chance of snow in the morning, then partly sunny in the afternoon. Windy and much cooler with highs in the mid 20s. Chance of snow 20 percent. Wind chill values as low as zero.
Monday Night
Mostly clear. Lows around 10 above. Wind chill values as low as 5 below.
Tuesday
Mostly sunny. Highs in the lower 30s. Wind chill values as low as 5 below in the morning.
Tuesday Night
Mostly cloudy. A slight chance of snow in the evening, then a chance of rain and snow after midnight. Not as cool with lows in the lower 20s. Chance of precipitation 40 percent.
Wednesday
Partly sunny. A slight chance of rain in the morning. Not as cool with highs in the lower 50s. Chance of rain 20 percent.



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146 PM CDT Thu Mar 12 2026
 
 

Additional Resources

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