Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair
66°F
19°C
| Humidity | 39% |
| Wind Speed | NW 14 mph |
| Barometer | 30.26 in (1024.7 mb) |
| Dewpoint | 40°F (4°C) |
| Visibility | 10.00 mi |
| Last update | 6 Apr 2:52 pm CDT |
Extended Forecast for
Saint Johns IL
This Afternoon

High: 65 °F
Sunny
Tonight

Low: 39 °F
Mostly Clear
Tuesday

High: 57 °F
Mostly Sunny
Tuesday Night

Low: 38 °F
Partly Cloudy
Wednesday

High: 73 °F
Mostly Sunny
Wednesday Night

Low: 53 °F
Partly Cloudy
Thursday

High: 74 °F
Sunny
Thursday Night

Low: 54 °F
Mostly Clear
Friday

High: 76 °F
Chance
Showers
Detailed Forecast
This Afternoon
Sunny, with a high near 65. Northwest wind around 9 mph, with gusts as high as 18 mph.
Tonight
Mostly clear, with a low around 39. North northeast wind around 7 mph.
Tuesday
Mostly sunny, with a high near 57. East northeast wind 9 to 13 mph, with gusts as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 38. East southeast wind around 7 mph.
Wednesday
Mostly sunny, with a high near 73. South wind 6 to 11 mph, with gusts as high as 18 mph.
Wednesday Night
Partly cloudy, with a low around 53. South wind around 9 mph.
Thursday
Sunny, with a high near 74. South wind 9 to 11 mph, with gusts as high as 18 mph.
Thursday Night
Mostly clear, with a low around 54. South wind around 7 mph.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 76. South southwest wind 6 to 9 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. West southwest wind around 5 mph becoming light and variable after midnight.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 78. East wind 5 to 7 mph becoming south southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 60. Southeast wind around 7 mph.
Sunday
Partly sunny, with a high near 83. South wind 8 to 15 mph, with gusts as high as 23 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
2:52 pm CDT Apr 6, 2026
2pm CDT Apr 6, 2026-6pm CDT Apr 12, 2026


