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

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Overcast

82°F

28°C

Humidity 70%
Wind Speed NA
Barometer 29.95 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 11 Jul 3:52 pm CDT
Extended Forecast for

3 Miles NW Saint Johns IL

Flood Watch July 11, 04:49pm until July 12, 01:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch July 11, 04:49pm until July 12, 01:00am

    NOW until 1:00am Sun

    Flood Watch

  • This Afternoon

    High: 80 °F

    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 1am. Partly cloudy, with a low around 68. North wind 5 to 7 mph. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers and thunderstorms between 3pm and 4pm. Mostly sunny, with a high near 84. North northeast wind 6 to 10 mph. Chance of precipitation is 20%.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 67. North wind 3 to 7 mph.

    Low: 67 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 86. North northeast wind 5 to 10 mph.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 68. North northeast wind around 6 mph becoming calm in the evening.

    Low: 68 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 88. East northeast wind 3 to 8 mph.

    High: 88 °F

    Sunny then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70. East wind around 5 mph becoming calm in the evening.

    Low: 70 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm before 5pm, then a chance of showers and thunderstorms after 5pm. Steady temperature around 80. West northwest wind around 7 mph. Chance of precipitation is 90%.
Tonight
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 1am. Partly cloudy, with a low around 68. North wind 5 to 7 mph. Chance of precipitation is 30%.
Sunday
A slight chance of showers and thunderstorms between 3pm and 4pm. Mostly sunny, with a high near 84. North northeast wind 6 to 10 mph. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 67. North wind 3 to 7 mph.
Monday
Sunny, with a high near 86. North northeast wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 68. North northeast wind around 6 mph becoming calm in the evening.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 88. East northeast wind 3 to 8 mph.
Tuesday Night
Partly cloudy, with a low around 70. East wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 89. Light and variable wind.
Wednesday Night
Mostly clear, with a low around 71. Calm wind.
Thursday
Sunny, with a high near 91. Light west southwest wind.
Thursday Night
Mostly clear, with a low around 73. Calm wind.
Friday
Sunny, with a high near 92. Calm wind becoming west around 5 mph in the afternoon.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Saint Johns IL
 38.06°N 89.27°W
Last Update:
1:26 pm CDT Jul 11, 2026
Forecast Valid:
4pm CDT Jul 11, 2026-6pm CDT Jul 17, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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