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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

62°F

17°C

Humidity 94%
Wind Speed Calm
Barometer 30.10 in
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 28 Aug 4:15 am CDT
Extended Forecast for

Bethalto IL

  • Today

    Today: Sunny, with a high near 87. Calm wind becoming north around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 62. Light east wind.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 88. Calm wind becoming south 5 to 8 mph in the morning.

    High: 88 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 67. South wind around 7 mph.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 94. South wind 7 to 11 mph.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

Detailed Forecast

Today
Sunny, with a high near 87. Calm wind becoming north around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 62. Light east wind.
Saturday
Mostly sunny, with a high near 88. Calm wind becoming south 5 to 8 mph in the morning.
Saturday Night
Partly cloudy, with a low around 67. South wind around 7 mph.
Sunday
Sunny, with a high near 94. South wind 7 to 11 mph.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny and hot, with a high near 97.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Mostly clear, with a low around 77.
Wednesday
Sunny and hot, with a high near 98.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
A 20 percent chance of showers. Sunny and hot, with a high near 99.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Bethalto IL
 38.9°N 90.05°W (Elev. 512 ft)
Last Update:
3:31 am CDT Aug 28, 2026
Forecast Valid:
4am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation