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

Excessive Rainfall and Severe Thunderstorms Threaten the Southern U.S. Again Thursday

A Moderate Risk (Level 3 of 4) Excessive Rainfall Outlook and Flood Watches have been issued for portions of east Texas into Louisiana Thursday where flash, urban, and riverine flooding is possible. A Slight Risk (Level 2 of 5) for scattered severe thunderstorms has been issued from west Texas to the lower Mississippi Valley Thursday afternoon into Thursday night. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

66°F

19°C

Humidity 93%
Wind Speed Calm
Barometer 29.80 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 16 May 11:15 pm CDT
Extended Forecast for

Alton IL

  • Tonight

    Tonight: A chance of showers and thunderstorms before 2am, then a slight chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%.

    Low: 62 °F

    Chance
    T-storms

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Patchy fog before 8am. Otherwise, partly sunny, with a high near 76. Calm wind becoming southeast 5 to 7 mph in the afternoon. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    T-storms and
    Patchy Fog

  • Friday Night

    Friday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 60. Southeast wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Partly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Patchy fog before 7am. Otherwise, mostly sunny, with a high near 83. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    T-storms and
    Patchy Fog

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64. North wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 2am, then a slight chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Patchy fog before 8am. Otherwise, partly sunny, with a high near 76. Calm wind becoming southeast 5 to 7 mph in the afternoon. Chance of precipitation is 40%.
Friday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 60. Southeast wind around 5 mph becoming calm in the evening.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Patchy fog before 7am. Otherwise, mostly sunny, with a high near 83. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 30%.
Saturday Night
Mostly clear, with a low around 64. North wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 88.
Sunday Night
Partly cloudy, with a low around 66.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.
Monday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Tuesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Wednesday
A 20 percent chance of showers. Mostly sunny, with a high near 79.
Wednesday Night
A 20 percent chance of showers. Mostly clear, with a low around 59.
Thursday
Sunny, with a high near 82.
Click Map For Forecast
Disclaimer
Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
Alton IL
 38.91°N 90.13°W (Elev. 499 ft)
Last Update:
10:07 pm CDT May 16, 2024
Forecast Valid:
11pm CDT May 16, 2024-6pm CDT May 23, 2024
 
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