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

Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

86°F

30°C

Humidity 46%
Wind Speed E 3 mph
Barometer 30.01 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 4 Aug 3:50 pm CDT
Extended Forecast for

Fidelity IL

  • Tonight

    Tonight: Mostly clear, with a low around 66. Southeast wind around 6 mph.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 87. South wind 5 to 10 mph.

    High: 87 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms. Low around 67. North wind 5 to 9 mph becoming light and variable after midnight. Chance of precipitation is 80%.

    Low: 67 °F

    T-storms

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 10am. High near 82. South wind around 5 mph. Chance of precipitation is 80%.

    High: 82 °F

    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. Light southeast wind.

    Low: 67 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 84.

    High: 84 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 66. Southeast wind around 6 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 87. South wind 5 to 10 mph.
Wednesday Night
Showers and thunderstorms. Low around 67. North wind 5 to 9 mph becoming light and variable after midnight. Chance of precipitation is 80%.
Thursday
Showers and thunderstorms, mainly before 10am. High near 82. South wind around 5 mph. Chance of precipitation is 80%.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. Light southeast wind.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 84.
Friday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 87.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70.
Sunday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 89.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny, with a high near 92.
Monday Night
Partly cloudy, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fidelity IL
 39.15°N 90.15°W (Elev. 617 ft)
Last Update:
1:26 pm CDT Aug 4, 2026
Forecast Valid:
4pm CDT Aug 4, 2026-6pm CDT Aug 11, 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