Current conditions at

St. Louis Regional Airport (KALN)

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

Fair

59°F

15°C

Humidity 94%
Wind Speed Calm
Barometer 30.18 in
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 23 Jun 4:55 am CDT
Detailed forecast for

Macoupin County

Rest Of Tonight
Mostly clear. Patchy fog. Near steady temperature in the upper 50s. North winds around 5 mph.
Tuesday
Patchy fog in the morning. Sunny. Highs in the upper 70s. Northeast winds around 5 mph.
Tuesday Night
Partly cloudy. Lows in the upper 50s. Southeast winds around 5 mph.
Wednesday
Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. South winds 5 to 10 mph, becoming southwest in the afternoon. Chance of rain 40 percent.
Wednesday Night
Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 60s. Southwest winds around 5 mph in the evening, becoming light and variable. Chance of rain 20 percent.
Thursday And Thursday Night
Showers and thunderstorms likely. Locally heavy rainfall possible. Highs in the lower 80s. Lows in the mid 60s. Chance of rain 70 percent.
Friday
Showers and thunderstorms. Highs around 80. Chance of rain 80 percent.
Friday Night
Showers likely with a chance of thunderstorms in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 60s. Chance of rain 70 percent.
Saturday
Mostly cloudy with a slight chance of showers and thunderstorms in the morning, then partly sunny in the afternoon. Highs in the upper 80s. Chance of rain 20 percent.
Saturday Night
Partly cloudy with a slight chance of showers and thunderstorms. Lows around 70. Chance of rain 20 percent.
Sunday Through Monday
Mostly clear. Highs in the mid 90s. Lows in the lower 70s. Heat index values up to 105.



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213 AM CDT Tue Jun 23 2026
 
 

Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database