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

Heat Persists in the South Central U.S. and California; Heavy Rain in the Ohio Valley

Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley, as well as in the Southwest and California this week with limited nighttime relief. Heavy rainfall will lead to localized areas of flash flooding in parts of the Ohio Valley/Central Appalachians. Dry and breezy conditions will enhance fire weather concerns across the northern Rockies and High Plains. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

70°F

21°C

Humidity 93%
Wind Speed Calm
Barometer 30.02 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 10 Sep 3:15 am CDT
Extended Forecast for

Standard City IL

  • Overnight

    Overnight: Showers likely and possibly a thunderstorm before 5am, then a chance of showers and thunderstorms after 5am. Cloudy, with a low around 67. Calm wind. Chance of precipitation is 70%.

    Low: 67 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and thunderstorms before 10am, then showers likely between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 78. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 80%.

    High: 78 °F

    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 8pm. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 62. Calm wind.

    Low: 62 °F

    Slight Chance
    Showers then
    Patchy Fog

  • Friday

    Friday: A 20 percent chance of showers after 3pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 81. Calm wind becoming east around 5 mph.

    High: 81 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Partly Cloudy

  • Saturday

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

    High: 87 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 66 °F

    Partly Cloudy

Detailed Forecast

Overnight
Showers likely and possibly a thunderstorm before 5am, then a chance of showers and thunderstorms after 5am. Cloudy, with a low around 67. Calm wind. Chance of precipitation is 70%.
Thursday
Showers and thunderstorms before 10am, then showers likely between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 78. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 80%.
Thursday Night
A 20 percent chance of showers before 8pm. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 62. Calm wind.
Friday
A 20 percent chance of showers after 3pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 81. Calm wind becoming east around 5 mph.
Friday Night
Partly cloudy, with a low around 64. Calm wind.
Saturday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 87.
Saturday Night
A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 66.
Monday
Sunny, with a high near 92.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 66.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Tuesday Night
A 40 percent chance of showers. Partly cloudy, with a low around 61.
Wednesday
A 40 percent chance of showers. Mostly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Standard City IL
 39.36°N 89.8°W (Elev. 650 ft)
Last Update:
1:26 am CDT Sep 10, 2026
Forecast Valid:
3am CDT Sep 10, 2026-6pm CDT Sep 16, 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