Hazardous Weather Conditions
Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair
67°F
19°C
| Humidity | 81% |
| Wind Speed | S 20 mph |
| Barometer | 29.85 in (1010.8 mb) |
| Dewpoint | 61°F (16°C) |
| Visibility | 10.00 mi |
| Last update | 9 Mar 7:52 pm CDT |
Extended Forecast for
Saint Johns IL
Tonight

Low: 62 °F
Mostly Cloudy
Tuesday
High: 78 °F
Partly Sunny
then Slight
Chance
ShowersTuesday Night
Low: 64 °F
Chance
T-storms then
ShowersWednesday

High: 71 °F
Showers
Wednesday Night
Low: 34 °F
Mostly Cloudy
and Breezy
then Mostly
CloudyThursday

High: 53 °F
Sunny
Thursday Night

Low: 42 °F
Partly Cloudy
Friday

High: 65 °F
Mostly Cloudy
Friday Night

Low: 41 °F
Mostly Cloudy
Detailed Forecast
Tonight
Mostly cloudy, with a low around 62. South southwest wind 9 to 13 mph, with gusts as high as 22 mph.
Tuesday
A 10 percent chance of showers after 5pm. Partly sunny, with a high near 78. South southwest wind 8 to 16 mph, with gusts as high as 24 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 64. South southwest wind 14 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.
Wednesday
Showers and possibly a thunderstorm. High near 71. South southwest wind 15 to 17 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 100%.
Wednesday Night
Mostly cloudy, with a low around 34. Breezy, with a north northwest wind 15 to 20 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 29 mph.
Thursday
Sunny, with a high near 53. North northwest wind around 6 mph becoming west southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 42. South wind 6 to 15 mph, with gusts as high as 25 mph.
Friday
Mostly cloudy, with a high near 65. Southwest wind 9 to 14 mph, with gusts as high as 24 mph.
Friday Night
Mostly cloudy, with a low around 41. North northwest wind around 6 mph becoming east after midnight.
Saturday
Mostly sunny, with a high near 69. East wind 7 to 11 mph becoming south in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Mostly clear, with a low around 52. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Sunday
A chance of showers. Partly sunny, with a high near 66. South southwest wind 14 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 28 mph.
Sunday Night
A chance of rain and snow showers. Partly cloudy, with a low around 30. Northwest wind 14 to 18 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 44. North northwest wind 10 to 13 mph, with gusts as high as 20 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
7:51 pm CDT Mar 9, 2026
8pm CDT Mar 9, 2026-6pm CDT Mar 16, 2026



