Showers and Storms in the East; Dangerously Hot and Dry in the West

A frontal boundary will bring scattered showers and storms to portions of the Central and Eastern U.S. through the end of the week. Meanwhile, dangerous heat will intensify across the Intermountain West and expand into the Central U.S. by early next week. Elevated wildfire conditions will develop across portions of the Northern/Central Plains and air quality issues will persist in the Northwest. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

79°F

26°C

Humidity 79%
Wind Speed E 6 mph
Barometer 30.01 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 5 Aug 6:45 pm CDT
Extended Forecast for

Saint Jacob IL

Flood Watch August 5, 10:00pm until August 6, 10:00am
Click here for hazard details and duration
Flood Watch
  • Tonight

    Tonight: Showers and thunderstorms likely, mainly after 4am.  Mostly cloudy, with a low around 72. South wind around 6 mph becoming calm  after midnight.  Chance of precipitation is 60%.

    Low: 72 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 1pm.  Mostly cloudy, with a high near 83. Calm wind becoming west around 5 mph in the morning.  Chance of precipitation is 70%.

    High: 83 °F

    T-storms
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly after 10pm.  Mostly cloudy, with a low around 71. Light southeast wind.

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms.  Partly sunny, with a high near 86. Southwest wind 3 to 6 mph.

    High: 86 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 71. Southwest wind around 5 mph becoming calm  in the evening.

    Low: 71 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly after 4am. Mostly cloudy, with a low around 72. South wind around 6 mph becoming calm after midnight. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 83. Calm wind becoming west around 5 mph in the morning. Chance of precipitation is 70%.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly after 10pm. Mostly cloudy, with a low around 71. Light southeast wind.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Southwest wind 3 to 6 mph.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Southwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 89.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Mostly sunny, with a high near 91.
Sunday Night
Mostly clear, with a low around 75.
Monday
Mostly sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Jacob IL
 38.7°N 89.77°W (Elev. 509 ft)
4:01 pm CDT Aug 5, 2026
7pm CDT Aug 5, 2026-6pm CDT Aug 12, 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