Hazardous Weather Conditions
Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair and Windy
43°F
6°C
| Humidity | 49% |
| Wind Speed | S 26 G 39 mph |
| Barometer | 29.68 in |
| Dewpoint | 25°F (-4°C) |
| Visibility | 10.00 mi |
| Wind Chill | 33°F (1°C) |
| Last update | 24 Feb 4:53 pm CST |
Extended Forecast for
Saint Johns IL
Tonight
Low: 38 °F
Mostly Cloudy
Wednesday
High: 54 °F
Slight Chance
ShowersWednesday Night
Low: 37 °F
Mostly Cloudy
then Chance
ShowersThursday
High: 51 °F
Chance
Showers then
Partly SunnyThursday Night
Low: 34 °F
Partly Cloudy
Friday
High: 62 °F
Sunny
Friday Night
Low: 41 °F
Mostly Clear
Saturday
High: 68 °F
Sunny
Saturday Night
Low: 35 °F
Partly Cloudy
Detailed Forecast
Tonight
Mostly cloudy, with a low around 38. South southwest wind 13 to 18 mph becoming light and variable after midnight. Winds could gust as high as 29 mph.
Wednesday
A slight chance of showers between 10am and 2pm. Mostly cloudy, with a high near 54. Light and variable wind. Chance of precipitation is 20%.
Wednesday Night
A 40 percent chance of showers after midnight. Mostly cloudy, with a low around 37. East northeast wind 3 to 7 mph.
Thursday
A 30 percent chance of showers before noon. Mostly cloudy, with a high near 51. East northeast wind 5 to 8 mph.
Thursday Night
Partly cloudy, with a low around 34. Light and variable wind.
Friday
Sunny, with a high near 62. Light southwest wind becoming south southwest 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 41. Southwest wind 5 to 8 mph.
Saturday
Sunny, with a high near 68. South wind 5 to 9 mph.
Saturday Night
Partly cloudy, with a low around 35. South wind 8 to 10 mph becoming north northeast in the evening. Winds could gust as high as 18 mph.
Sunday
A chance of showers, mainly after noon. Partly sunny, with a high near 50. Northeast wind around 11 mph, with gusts as high as 18 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 35. East northeast wind around 10 mph.
Monday
A slight chance of showers. Mostly cloudy, with a high near 54. East southeast wind around 10 mph, with gusts as high as 18 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 36. East southeast wind around 8 mph.
Tuesday
A chance of showers. Mostly cloudy, with a high near 56. North northeast wind 7 to 9 mph becoming southwest in the morning.
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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
4:37 pm CST Feb 24, 2026
5pm CST Feb 24, 2026-6pm CST Mar 3, 2026
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