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.

Fair

40°F

4°C

Humidity 89%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 30 Apr 4:15 am CDT
Extended Forecast for

2 Miles WSW Alton IL

Flood Warning until May 2, 10:00pm
Click here for hazard details and duration
Flood Warning
  •  
    Flood Warning until May 2, 10:00pm

    NOW until 10:00pm Sat

    Flood Warning

  • Overnight

    Low: 40 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 7am. Otherwise, sunny, with a high near 65. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 65 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: A 40 percent chance of showers, mainly before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 44. Northwest wind around 6 mph.

    Low: 44 °F

    Chance
    Showers then
    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 60. North wind 5 to 10 mph.

    High: 60 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 43. North wind around 6 mph becoming calm in the evening.

    Low: 43 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

Detailed Forecast

Overnight
Patchy fog. Otherwise, clear, with a low around 40. Calm wind.
Thursday
Patchy fog before 7am. Otherwise, sunny, with a high near 65. Calm wind becoming west 5 to 7 mph in the afternoon.
Thursday Night
A 40 percent chance of showers, mainly before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 44. Northwest wind around 6 mph.
Friday
Sunny, with a high near 60. North wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 43. North wind around 6 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 61.
Saturday Night
Mostly clear, with a low around 41.
Sunday
Sunny, with a high near 74.
Sunday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 56. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 78.
Monday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 55.
Tuesday
Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 75. Chance of precipitation is 60%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 71.
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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:
4:26 am CDT Apr 30, 2026
Forecast Valid:
4am CDT Apr 30, 2026-6pm CDT May 6, 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