Hazardous Weather Conditions
Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair
26°F
-3°C
| Humidity | 60% |
| Wind Speed | NW 8 mph |
| Barometer | 30.34 in (1027.8 mb) |
| Dewpoint | 14°F (-10°C) |
| Visibility | 10.00 mi |
| Wind Chill | 18°F (-8°C) |
| Last update | 22 Feb 4:52 am CST |
Extended Forecast for
Saint Johns IL
Today
High: 32 °F
Mostly Sunny
and BreezyTonight
Low: 16 °F
Mostly Clear
Monday
High: 33 °F
Sunny
Monday Night
Low: 18 °F
Mostly Clear
Tuesday
High: 50 °F
Mostly Cloudy
Tuesday Night
Low: 39 °F
Mostly Cloudy
Wednesday
High: 57 °F
Partly Sunny
Wednesday Night
Low: 40 °F
Chance
ShowersThursday
High: 53 °F
Chance
Showers
Detailed Forecast
Today
Mostly sunny, with a high near 32. Breezy, with a northwest wind 13 to 21 mph, with gusts as high as 31 mph.
Tonight
Mostly clear, with a low around 16. North northwest wind around 15 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 33. Northwest wind 6 to 14 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 18. Calm wind becoming south around 6 mph after midnight.
Tuesday
Mostly cloudy, with a high near 50. South southwest wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph.
Tuesday Night
Mostly cloudy, with a low around 39. Southwest wind 6 to 15 mph, with gusts as high as 24 mph.
Wednesday
Partly sunny, with a high near 57. West southwest wind 6 to 8 mph becoming south in the afternoon.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 40. South southeast wind 6 to 10 mph becoming southwest after midnight.
Thursday
A chance of showers, mainly before noon. Partly sunny, with a high near 53. West southwest wind 8 to 10 mph becoming north northwest in the afternoon.
Thursday Night
Mostly clear, with a low around 30. North northwest wind 5 to 7 mph becoming light and variable after midnight.
Friday
Sunny, with a high near 59. South wind 3 to 8 mph.
Friday Night
Mostly clear, with a low around 40. South wind around 8 mph.
Saturday
A slight chance of showers. Sunny, with a high near 63. South wind 8 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Saint Johns IL
38.03°N 89.24°W
38.03°N 89.24°W
4:41 am CST Feb 22, 2026
5am CST Feb 22, 2026-6pm CST Feb 28, 2026
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