Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Mostly Cloudy
45°F
7°C
| Humidity | 56% |
| Wind Speed | NW 15 G 25 mph |
| Barometer | 30.13 in (1020.5 mb) |
| Dewpoint | 30°F (-1°C) |
| Visibility | 10.00 mi |
| Wind Chill | 38°F (3°C) |
| Last update | 10 Jan 1:52 pm CST |
Extended Forecast for
Saint Johns IL
This Afternoon
High: 43 °F
Mostly Sunny
Tonight
Low: 26 °F
Chance
Showers then
Slight Chance
Sprinkles/FlurriesSunday
High: 39 °F
Sunny
Sunday Night
Low: 26 °F
Clear
Monday
High: 51 °F
Sunny
Monday Night
Low: 36 °F
Mostly Clear
Tuesday
High: 58 °F
Mostly Sunny
Tuesday Night
Low: 40 °F
Mostly Cloudy
Wednesday
High: 45 °F
Mostly Cloudy
Detailed Forecast
This Afternoon
Mostly sunny, with a steady temperature around 43. Northwest wind around 7 mph becoming west southwest. Winds could gust as high as 26 mph.
Tonight
A chance of rain showers before midnight, then a slight chance of sprinkles between midnight and 1am, then a slight chance of flurries after 1am. Partly cloudy, with a low around 26. Southwest wind 5 to 10 mph becoming northwest 13 to 18 mph in the evening. Winds could gust as high as 28 mph. Chance of precipitation is 30%.
Sunday
Sunny, with a high near 39. Northwest wind 6 to 15 mph, with gusts as high as 28 mph.
Sunday Night
Clear, with a low around 26. Calm wind becoming south southwest 5 to 7 mph after midnight.
Monday
Sunny, with a high near 51. Southwest wind 7 to 10 mph.
Monday Night
Mostly clear, with a low around 36. South southwest wind 6 to 9 mph.
Tuesday
Mostly sunny, with a high near 58. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly cloudy, with a low around 40. West wind 6 to 9 mph.
Wednesday
Mostly cloudy, with a high near 45. North northwest wind 7 to 14 mph, with gusts as high as 21 mph.
Wednesday Night
Partly cloudy, with a low around 20. North northwest wind 7 to 11 mph, with gusts as high as 18 mph.
Thursday
Mostly sunny, with a high near 37. North northwest wind around 8 mph becoming southwest in the afternoon.
Thursday Night
Mostly cloudy, with a low around 28. South southwest wind 6 to 9 mph.
Friday
Partly sunny, with a high near 43. West southwest wind 9 to 14 mph, with gusts as high as 22 mph.
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Saint Johns IL
38.06°N 89.24°W
38.06°N 89.24°W
2:01 pm CST Jan 10, 2026
2pm CST Jan 10, 2026-6pm CST Jan 16, 2026
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