An Active Weather Wednesday

Strong to severe thunderstorms are possible on Wednesday in parts of the Ohio Valley, Upper Mississippi Valley and south-central Plains. These storms may produce heavy rain and flooding in the Ohio Valley. Meanwhile, a strong cold front will sweep through the Northwest U.S. with rain, mountain snow and high winds. Finally, heat and record high temperatures are likely across the Southern U.S. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

68°F

20°C

Humidity 67%
Wind Speed S 8 mph
Barometer 29.87 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 18 May 4:35 am CDT
Extended Forecast for

Alton ILSimilar City Names

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms.  Cloudy, with a low around 64. South wind around 7 mph.

    Chance
    T-storms

    Low: 64 °F

  • Wednesday

    Wednesday: Showers and thunderstorms before noon, then a slight chance of showers and thunderstorms after 3pm. Some of the storms could produce heavy rainfall.  High near 79. South wind 8 to 10 mph becoming west in the afternoon.  Chance of precipitation is 90%.

    Heavy Rain
    then Slight
    Chance
    T-storms

    High: 79 °F

  • Wednesday
    Night

    Wednesday Night: Partly cloudy, with a low around 64. Northwest wind 3 to 8 mph.

    Partly Cloudy

    Low: 64 °F

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 87. Light south wind increasing to 9 to 14 mph in the morning.

    Mostly Sunny
    then Slight
    Chance
    T-storms

    High: 87 °F

  • Thursday
    Night

    Thursday Night: Mostly clear, with a low around 72. South wind around 11 mph.

    Mostly Clear

    Low: 72 °F

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 89.

    Mostly Sunny
    then Slight
    Chance
    T-storms

    High: 89 °F

  • Friday
    Night

    Friday Night: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a low around 62. Chance of precipitation is 70%.

    Showers
    Likely

    Low: 62 °F

  • Saturday

    Saturday: Showers and possibly a thunderstorm.  High near 68. Chance of precipitation is 80%.

    Showers

    High: 68 °F

  • Saturday
    Night

    Saturday Night: A 50 percent chance of showers, mainly before 1am.  Mostly cloudy, with a low around 49.

    Chance
    Showers

    Low: 49 °F

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms. Cloudy, with a low around 64. South wind around 7 mph.
Wednesday
Showers and thunderstorms before noon, then a slight chance of showers and thunderstorms after 3pm. Some of the storms could produce heavy rainfall. High near 79. South wind 8 to 10 mph becoming west in the afternoon. Chance of precipitation is 90%.
Wednesday Night
Partly cloudy, with a low around 64. Northwest wind 3 to 8 mph.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Light south wind increasing to 9 to 14 mph in the morning.
Thursday Night
Mostly clear, with a low around 72. South wind around 11 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Saturday
Showers and possibly a thunderstorm. High near 68. Chance of precipitation is 80%.
Saturday Night
A 50 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 49.
Sunday
Mostly sunny, with a high near 67.
Sunday Night
Partly cloudy, with a low around 51.
Monday
Mostly sunny, with a high near 71.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 57.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 75.
Click Map For Forecast
Point Forecast:
Alton ILSimilar City Names
 38.91°N 90.16°W (Elev. 505 ft)
4:26 am CDT May 18, 2022
4am CDT May 18, 2022-6pm CDT May 24, 2022
 
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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