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

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Overcast

75°F

24°C

Humidity 89%
Wind Speed SE 7 mph
Barometer 29.92 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 26 Jun 6:50 pm CDT
Extended Forecast for

Saint Jacob IL

Flood Watch June 26, 07:45pm until June 26, 10:00pm
Click here for hazard details and duration
...
  •  
    Flood Watch June 26, 07:45pm until June 26, 10:00pm

    NOW until 10:00pm Fri

    Flood Watch

  • Tonight

    Low: 68 °F

    Showers
    Likely then
    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms, mainly between 10am and 11am. Mostly cloudy, with a high near 83. Light and variable wind becoming west 5 to 7 mph in the morning.

    High: 83 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly between midnight and 4am. Mostly cloudy, with a low around 72. Southeast wind around 6 mph.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 109. South wind 6 to 11 mph.

    High: 92 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Mostly cloudy, with a low around 68. South wind 3 to 7 mph. Chance of precipitation is 60%.
Saturday
A 20 percent chance of showers and thunderstorms, mainly between 10am and 11am. Mostly cloudy, with a high near 83. Light and variable wind becoming west 5 to 7 mph in the morning.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly between midnight and 4am. Mostly cloudy, with a low around 72. Southeast wind around 6 mph.
Sunday
Mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 109. South wind 6 to 11 mph.
Sunday Night
Mostly clear, with a low around 75. South wind 5 to 10 mph.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Sunny, with a high near 95.
Tuesday Night
Clear, with a low around 76.
Wednesday
Sunny, with a high near 95.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny, with a high near 95.
Thursday Night
Mostly clear, with a low around 76.
Friday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 95.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Jacob IL
 38.72°N 89.77°W (Elev. 499 ft)
Last Update:
7:11 pm CDT Jun 26, 2026
Forecast Valid:
7pm CDT Jun 26, 2026-6pm CDT Jul 3, 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