Hazardous Weather Conditions
Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair and Windy
63°F
17°C
| Humidity | 68% |
| Wind Speed | S 32 G 43 mph |
| Barometer | 29.59 in (1001.7 mb) |
| Dewpoint | 52°F (11°C) |
| Visibility | 10.00 mi |
| Last update | 15 Mar 7:52 am CDT |
Extended Forecast for
Saint Johns IL
Wind Advisory March 15, 10:00am until March 16, 07:00am
Today
High: 68 °F
Breezy.
Mostly Cloudy
then ShowersTonight
Low: 24 °F
Showers and
Breezy then
Mostly Cloudy
and BlusteryMonday

High: 33 °F
Mostly Cloudy
and BreezyMonday Night

Low: 15 °F
Mostly Clear
Tuesday

High: 38 °F
Sunny
Tuesday Night
Low: 30 °F
Mostly Cloudy
then Slight
Chance Snow
ShowersWednesday

High: 60 °F
Partly Sunny
Wednesday Night

Low: 42 °F
Partly Cloudy
Thursday

High: 70 °F
Sunny
Detailed Forecast
Today
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3pm. High near 68. Breezy, with a south wind 20 to 26 mph, with gusts as high as 41 mph. Chance of precipitation is 80%.
Tonight
Showers and possibly a thunderstorm before 9pm, then a chance of showers between 9pm and 10pm. Low around 24. Breezy, with a west northwest wind 23 to 26 mph, with gusts as high as 43 mph. Chance of precipitation is 90%.
Monday
Mostly cloudy, with a high near 33. Breezy, with a west northwest wind 20 to 22 mph, with gusts as high as 33 mph.
Monday Night
Mostly clear, with a low around 15. West northwest wind 9 to 18 mph, with gusts as high as 26 mph.
Tuesday
Sunny, with a high near 38. Northwest wind around 7 mph becoming west southwest in the afternoon.
Tuesday Night
A 20 percent chance of snow showers after 1am. Mostly cloudy, with a low around 30. Light south southeast wind becoming south 9 to 14 mph in the evening. Winds could gust as high as 22 mph.
Wednesday
Partly sunny, with a high near 60. South wind 11 to 15 mph, with gusts as high as 23 mph.
Wednesday Night
Partly cloudy, with a low around 42. South southwest wind around 7 mph.
Thursday
Sunny, with a high near 70. South southwest wind around 7 mph becoming west in the afternoon.
Thursday Night
Partly cloudy, with a low around 45. Northwest wind around 5 mph becoming southeast after midnight.
Friday
Mostly sunny, with a high near 73. Southwest wind 5 to 8 mph.
Friday Night
Partly cloudy, with a low around 49. Southwest wind 6 to 8 mph becoming northwest after midnight.
Saturday
Mostly sunny, with a high near 68. North northwest wind 8 to 10 mph.
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ABOUT THIS FORECAST
Point Forecast:
Saint Johns IL
38.03°N 89.24°W
38.03°N 89.24°W
6:21 am CDT Mar 15, 2026
8am CDT Mar 15, 2026-6pm CDT Mar 21, 2026



