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.

Partly Cloudy

67°F

19°C

Humidity 68%
Wind Speed NE 5 mph
Barometer 30.03 in (1016.6 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 1 Apr 12:52 pm CDT
Extended Forecast for

2 Miles N Saint Johns IL

  • This Afternoon

    This Afternoon: Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. High near 71. North northwest wind 6 to 9 mph becoming south southeast. Chance of precipitation is 80%.

    High: 71 °F

    Showers

  • Tonight

    Tonight: A 30 percent chance of showers, mainly before 8pm. Mostly cloudy, with a low around 64. East southeast wind 6 to 14 mph becoming south after midnight. Winds could gust as high as 23 mph.

    Low: 64 °F

    Chance
    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78. Breezy, with a south wind 16 to 23 mph, with gusts as high as 33 mph.

    High: 78 °F

    Breezy.
    Mostly Cloudy
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am, then showers likely between 1am and 4am, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, then gradually becoming mostly clear, with a low around 64. South wind 10 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.

    Low: 64 °F

    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. South wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 59. South wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.

    Low: 59 °F

    Chance
    Showers then
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 69. South southwest wind 11 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%.

    High: 69 °F

    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers before 1am. Partly cloudy, with a low around 40. West northwest wind 7 to 10 mph.

    Low: 40 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 59. Northwest wind 7 to 11 mph, with gusts as high as 18 mph.

    High: 59 °F

    Sunny

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. High near 71. North northwest wind 6 to 9 mph becoming south southeast. Chance of precipitation is 80%.
Tonight
A 30 percent chance of showers, mainly before 8pm. Mostly cloudy, with a low around 64. East southeast wind 6 to 14 mph becoming south after midnight. Winds could gust as high as 23 mph.
Thursday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78. Breezy, with a south wind 16 to 23 mph, with gusts as high as 33 mph.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then showers likely between 1am and 4am, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, then gradually becoming mostly clear, with a low around 64. South wind 10 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.
Friday
Showers likely and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. South wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 59. South wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.
Saturday
Showers and possibly a thunderstorm. High near 69. South southwest wind 11 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%.
Saturday Night
A slight chance of showers before 1am. Partly cloudy, with a low around 40. West northwest wind 7 to 10 mph.
Sunday
Sunny, with a high near 59. Northwest wind 7 to 11 mph, with gusts as high as 18 mph.
Sunday Night
Clear, with a low around 37. North northwest wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 65. Calm wind becoming northwest around 6 mph in the morning.
Monday Night
Partly cloudy, with a low around 41. North wind around 6 mph.
Tuesday
Mostly sunny, with a high near 59. Northeast wind 6 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Saint Johns IL
 38.06°N 89.24°W
Last Update:
12:18 pm CDT Apr 1, 2026
Forecast Valid:
1pm CDT Apr 1, 2026-6pm CDT Apr 7, 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