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 Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

88°F

31°C

Humidity 50%
Wind Speed Vrbl 7 mph
Barometer 30.00 in (1015.5 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 4 Aug 2:53 pm CDT
Extended Forecast for

Waterloo IL

  • Tonight

    Tonight: Mostly clear, with a low around 66. Southeast wind 3 to 6 mph.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 89. South wind 3 to 8 mph.

    High: 89 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms, mainly after midnight.  Increasing clouds, with a low around 70. Southeast wind 3 to 7 mph.

    Low: 70 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 1pm.  High near 84. South wind around 5 mph becoming calm  in the afternoon.  Chance of precipitation is 80%.

    High: 84 °F

    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 69. Light southeast wind.  Chance of precipitation is 60%.

    Low: 69 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 85.

    High: 85 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

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

    Low: 69 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 66. Southeast wind 3 to 6 mph.
Wednesday
Sunny, with a high near 89. South wind 3 to 8 mph.
Wednesday Night
A 50 percent chance of showers and thunderstorms, mainly after midnight. Increasing clouds, with a low around 70. Southeast wind 3 to 7 mph.
Thursday
Showers and thunderstorms, mainly before 1pm. High near 84. South wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 80%.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Light southeast wind. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.
Friday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Saturday
Mostly sunny, with a high near 88.
Saturday Night
Mostly clear, with a low around 71.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 74.
Tuesday
Mostly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.33°N 90.16°W (Elev. 600 ft)
1:26 pm CDT Aug 4, 2026
3pm CDT Aug 4, 2026-6pm CDT Aug 11, 2026
 
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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