Hazardous Weather Conditions
Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair
52°F
11°C
| Humidity | 54% |
| Wind Speed | Calm |
| Barometer | 30.23 in |
| Dewpoint | 36°F (2°C) |
| Visibility | 7.00 mi |
| Last update | 2 Nov 4:52 pm CST |
Extended Forecast for
Saint Johns IL
Tonight
Low: 37 °F
Clear
Monday
High: 64 °F
Sunny
Monday Night
Low: 39 °F
Mostly Clear
Tuesday
High: 67 °F
Mostly Sunny
Tuesday Night
Low: 50 °F
Partly Cloudy
Wednesday
High: 72 °F
Sunny
Wednesday Night
Low: 42 °F
Mostly Clear
Thursday
High: 68 °F
Sunny
Thursday Night
Low: 52 °F
Partly Cloudy
then Chance
Showers
Detailed Forecast
Tonight
Clear, with a low around 37. Calm wind becoming south southwest around 6 mph after midnight.
Monday
Sunny, with a high near 64. Southwest wind 5 to 10 mph becoming light and variable in the afternoon.
Monday Night
Mostly clear, with a low around 39. Calm wind.
Tuesday
Mostly sunny, with a high near 67. Light south southeast wind becoming south 10 to 15 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 50. South southwest wind 10 to 13 mph, with gusts as high as 18 mph.
Wednesday
Sunny, with a high near 72. South southwest wind 7 to 11 mph becoming west in the afternoon.
Wednesday Night
Mostly clear, with a low around 42. West wind around 6 mph becoming light and variable in the evening.
Thursday
Sunny, with a high near 68. Light and variable wind becoming southeast 6 to 11 mph in the morning.
Thursday Night
A chance of showers after midnight. Partly cloudy, with a low around 52. South wind 10 to 13 mph, with gusts as high as 18 mph.
Friday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 71. South southwest wind 9 to 15 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Friday Night
Mostly clear, with a low around 44. West wind 5 to 7 mph.
Saturday
Mostly sunny, with a high near 66. Southwest wind 5 to 11 mph.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 43. South southwest wind 7 to 9 mph becoming west after midnight.
Sunday
Mostly sunny, with a high near 58. Northwest wind 8 to 13 mph, with gusts as high as 18 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
Saint Johns IL
38.03°N 89.24°W
38.03°N 89.24°W
3:16 pm CST Nov 2, 2025
5pm CST Nov 2, 2025-6pm CST Nov 9, 2025
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
