Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair
30°F
-1°C
| Humidity | 64% |
| Wind Speed | S 12 mph |
| Barometer | 30.21 in (1023.4 mb) |
| Dewpoint | 19°F (-7°C) |
| Visibility | 10.00 mi |
| Wind Chill | 20°F (-7°C) |
| Last update | 30 Dec 6:52 pm CST |
Extended Forecast for
Saint Johns IL
Tonight
Low: 27 °F
Mostly Clear
Wednesday
High: 42 °F
Partly Sunny
Wednesday Night
Low: 27 °F
Partly Cloudy
New Year's Day
High: 39 °F
Partly Sunny
Thursday Night
Low: 31 °F
Mostly Cloudy
Friday
High: 45 °F
Mostly Cloudy
Friday Night
Low: 26 °F
Mostly Cloudy
Saturday
High: 41 °F
Mostly Sunny
Saturday Night
Low: 26 °F
Mostly Clear
Detailed Forecast
Tonight
Mostly clear, with a low around 27. Southwest wind around 6 mph.
Wednesday
Partly sunny, with a high near 42. West northwest wind 6 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 27. Light and variable wind.
New Year's Day
Partly sunny, with a high near 39. Calm wind becoming east northeast around 5 mph.
Thursday Night
Mostly cloudy, with a low around 31. Calm wind.
Friday
Mostly cloudy, with a high near 45. Calm wind becoming north northeast around 6 mph in the morning.
Friday Night
Mostly cloudy, with a low around 26. North northeast wind around 6 mph.
Saturday
Mostly sunny, with a high near 41. North northeast wind 3 to 6 mph.
Saturday Night
Mostly clear, with a low around 26. Calm wind.
Sunday
Partly sunny, with a high near 47. Calm wind becoming south 5 to 8 mph in the morning.
Sunday Night
Partly cloudy, with a low around 35. West southwest wind around 7 mph.
Monday
Mostly sunny, with a high near 52. West southwest wind 6 to 9 mph becoming northwest in the afternoon.
Monday Night
Partly cloudy, with a low around 31. Northwest wind around 6 mph.
Tuesday
Mostly sunny, with a high near 47. Northwest wind 5 to 7 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
4:16 pm CST Dec 30, 2025
7pm CST Dec 30, 2025-6pm CST Jan 6, 2026
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