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Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

34°F

1°C

Humidity 92%
Wind Speed Calm
Barometer 30.21 in (1023.1 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 8 Nov 1:52 am CST
Extended Forecast for

Saint Johns IL

Freeze Warning November 8, 02:16am until November 8, 08:00am
Click here for hazard details and duration
Freeze Warning
  •  
    Freeze Warning November 8, 02:16am until November 8, 08:00am

    NOW until 8:00am Sun

    Freeze Warning

  • Overnight

    Low: 32 °F

    Frost and
    Patchy Fog

  • Sunday

    Sunday: Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 64. Calm wind becoming west southwest 5 to 8 mph in the morning.

    High: 64 °F

    Frost then
    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 11pm. Otherwise, mostly clear, with a low around 38. Light and variable wind.

    Low: 38 °F

    Patchy Fog

  • Monday

    Monday: Patchy fog before 10am. Otherwise, sunny, with a high near 66. Light and variable wind.

    High: 66 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Clear, with a low around 41. Light west southwest wind.

    Low: 41 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 70. Calm wind becoming west southwest around 6 mph.

    High: 70 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 45. Calm wind.

    Low: 45 °F

    Mostly Clear

  • Veterans Day

    Veterans Day: A chance of showers and thunderstorms after noon. Partly sunny, with a high near 68. Calm wind becoming west 5 to 8 mph in the afternoon.

    High: 68 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

Overnight
Patchy fog between 4am and 5am. Widespread frost. Otherwise, mostly clear, with a steady temperature around 32. Calm wind.
Sunday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 64. Calm wind becoming west southwest 5 to 8 mph in the morning.
Sunday Night
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 38. Light and variable wind.
Monday
Patchy fog before 10am. Otherwise, sunny, with a high near 66. Light and variable wind.
Monday Night
Clear, with a low around 41. Light west southwest wind.
Tuesday
Sunny, with a high near 70. Calm wind becoming west southwest around 6 mph.
Tuesday Night
Mostly clear, with a low around 45. Calm wind.
Veterans Day
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 68. Calm wind becoming west 5 to 8 mph in the afternoon.
Wednesday Night
A slight chance of showers before midnight. Mostly cloudy, with a low around 41. North wind 6 to 10 mph.
Thursday
Mostly sunny, with a high near 55. North wind 10 to 16 mph, with gusts as high as 21 mph.
Thursday Night
Partly cloudy, with a low around 32. North wind 5 to 10 mph.
Friday
Mostly sunny, with a high near 50. North northwest wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 30. Calm wind.
Saturday
Sunny, with a high near 56. Calm wind becoming northwest 5 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Johns IL
 38.06°N 89.24°W
Last Update:
12:21 am CST Nov 8, 2026
Forecast Valid:
2am CST Nov 8, 2026-6pm CST Nov 14, 2026
 
Forecast Discussion
 
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Additional Resources

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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