Current conditions at

St. Louis Regional Airport (KALN)

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

Fair

52°F

11°C

Humidity 94%
Wind Speed Calm
Barometer 30.04 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 29 Sep 7:50 am CDT
Detailed forecast for

Macoupin County

Today
Sunny. Highs in the lower 80s. South winds 5 to 10 mph.
Tonight
Mostly cloudy. Not as cool with lows in the lower 60s. Southeast winds around 5 mph.
Wednesday
Mostly cloudy. Highs in the upper 80s. South winds 5 to 10 mph.
Wednesday Night
Mostly cloudy. Lows in the upper 60s. South winds 5 to 10 mph.
Thursday
Mostly cloudy with a 50 percent chance of showers. Highs in the mid 80s. Southwest winds 5 to 10 mph.
Thursday Night
A slight chance of thunderstorms. Showers. Lows in the lower 60s. Chance of rain 80 percent.
Friday
Showers likely, mainly in the morning. Cooler with highs in the lower 70s. Chance of rain 70 percent.
Friday Night
Mostly cloudy with a 50 percent chance of showers. Lows in the mid 50s.
Saturday And Saturday Night
Mostly cloudy. A 20 percent chance of showers. Highs in the upper 60s. Lows in the mid 50s.
Sunday
Mostly sunny. Highs around 70.
Sunday Night And Monday
Mostly clear. Lows around 50. Highs in the upper 60s.



Basemap Options
Click map to change the forecast location
Loading map...
548 AM CDT Tue Sep 29 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database