Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Light Rain
46°F
8°C
| Humidity | 89% |
| Wind Speed | Calm |
| Barometer | 29.87 in (1011.5 mb) |
| Dewpoint | 43°F (6°C) |
| Visibility | 9.00 mi |
| Last update | 14 Feb 9:52 pm CST |
Extended Forecast for
Saint Johns IL
Tonight
Low: 47 °F
Showers
Sunday
High: 57 °F
Chance
Showers then
Partly SunnySunday Night
Low: 37 °F
Mostly Clear
Washington's Birthday
High: 61 °F
Mostly Sunny
Monday Night
Low: 44 °F
Mostly Cloudy
Tuesday
High: 65 °F
Mostly Cloudy
Tuesday Night
Low: 58 °F
Mostly Cloudy
and BreezyWednesday
High: 72 °F
Mostly Sunny
Wednesday Night
Low: 49 °F
Partly Cloudy
Detailed Forecast
Tonight
Showers. Steady temperature around 47. Northeast wind 5 to 8 mph. Chance of precipitation is 100%.
Sunday
A 40 percent chance of showers before 9am. Cloudy, then gradually becoming mostly sunny, with a high near 57. North northeast wind 6 to 11 mph, with gusts as high as 18 mph.
Sunday Night
Mostly clear, with a low around 37. North wind around 5 mph becoming calm in the evening.
Washington's Birthday
Mostly sunny, with a high near 61. Calm wind becoming south 5 to 8 mph in the morning.
Monday Night
Mostly cloudy, with a low around 44. South wind around 6 mph.
Tuesday
Mostly cloudy, with a high near 65. South wind 7 to 17 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly cloudy, with a low around 58. Breezy, with a south southwest wind 18 to 20 mph, with gusts as high as 31 mph.
Wednesday
Mostly sunny, with a high near 72. West southwest wind 13 to 17 mph, with gusts as high as 28 mph.
Wednesday Night
Partly cloudy, with a low around 49. South southwest wind 7 to 11 mph, with gusts as high as 18 mph.
Thursday
A chance of showers, mainly after noon. Mostly sunny, with a high near 71. South southwest wind 7 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 43. South southwest wind 7 to 11 mph becoming west northwest after midnight.
Friday
A slight chance of showers. Partly sunny, with a high near 57. West northwest wind 7 to 9 mph.
Friday Night
A slight chance of showers. Partly cloudy, with a low around 33. Northwest wind around 7 mph.
Saturday
Mostly sunny, with a high near 51. Northwest wind 6 to 9 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
8:52 pm CST Feb 14, 2026
9pm CST Feb 14, 2026-6pm CST Feb 21, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
