National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Mostly Cloudy

57°F

14°C

Humidity 36%
Wind Speed N 6 mph
Barometer 30.07 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 1 May 2:45 pm CDT
Extended Forecast for

2 Miles WSW Alton IL

Flood Warning May 1, 03:43pm until May 3, 05:00am
Click here for hazard details and duration
Flood Warning
  •  
    Flood Warning May 1, 03:43pm until May 3, 05:00am

    NOW until 5:00am Sun

    Flood Warning

  • Tonight

    Low: 43 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 61. North wind 5 to 10 mph.

    High: 61 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 42. Northwest wind around 6 mph becoming calm in the evening.

    Low: 42 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 75. Southwest wind 6 to 15 mph, with gusts as high as 24 mph.

    High: 75 °F

    Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Southwest wind 6 to 10 mph. Chance of precipitation is 50%.

    Low: 54 °F

    Chance
    T-storms

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 79. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.

    Low: 56 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 67. Chance of precipitation is 80%.

    High: 67 °F

    Showers

Detailed Forecast

Tonight
A slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 43. Northwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.
Saturday
Mostly sunny, with a high near 61. North wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 42. Northwest wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 75. Southwest wind 6 to 15 mph, with gusts as high as 24 mph.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Southwest wind 6 to 10 mph. Chance of precipitation is 50%.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 79. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.
Tuesday
Showers and possibly a thunderstorm. High near 67. Chance of precipitation is 80%.
Tuesday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 46. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers. Partly sunny, with a high near 62.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 45.
Thursday
Mostly sunny, with a high near 65.
Thursday Night
Partly cloudy, with a low around 45.
Friday
Sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Alton IL
 38.88°N 90.19°W (Elev. 407 ft)
Last Update:
1:35 pm CDT May 1, 2026
Forecast Valid:
3pm CDT May 1, 2026-6pm CDT May 8, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation