Areas of Dangerous Heat and Heavy Rainfall Today

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley today. Heat Advisories remain in effect. Heavy to excessive rainfall today could bring areas of flooding to parts of the northern High Plains and Midwest into the Ohio Valley. Flood Watches remain in effect. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

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

Fair

90°F

32°C

Humidity 46%
Wind Speed E 6 mph
Barometer 29.88 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 20 Sep 2:50 pm CDT
Detailed forecast for

Madison County

Tonight
Mostly cloudy with a chance of thunderstorms. A chance of showers this evening, then showers likely after midnight. Lows in the upper 60s. North winds 5 to 10 mph. Chance of rain 70 percent.
Monday
Mostly cloudy. A chance of showers and thunderstorms in the morning. Patchy fog in the morning. Much cooler with highs in the mid 70s. North winds 5 to 10 mph. Chance of rain 40 percent.
Monday Night
Mostly cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph.
Tuesday
Partly sunny. Highs in the lower 70s. Northeast winds 5 to 10 mph.
Tuesday Night
Mostly cloudy in the evening, then becoming partly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.
Wednesday
Mostly sunny. Highs in the mid 70s.
Wednesday Night
Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 50s.
Thursday
Mostly sunny. Highs in the mid 70s.
Thursday Night And Friday
Mostly cloudy. Lows in the mid 50s. Highs in the upper 70s.
Friday Night And Saturday
Mostly cloudy with a 20 percent chance of showers. Lows in the upper 50s. Highs in the upper 70s.
Saturday Night
Mostly cloudy. Lows in the upper 50s.
Sunday
Mostly sunny. Highs in the mid 80s.



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238 PM CDT Sun Sep 20 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database