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Hazardous Weather Conditions
Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair
82°F
28°C
| Humidity | 72% |
| Wind Speed | Calm |
| Barometer | 30.07 in (1017.9 mb) |
| Dewpoint | 72°F (22°C) |
| Visibility | 10.00 mi |
| Heat Index | 87°F (31°C) |
| Last update | 18 Aug 8:52 am CDT |
Extended Forecast for
2 Miles ENE Saint Johns IL
Heat Advisory August 18, 09:06am until August 19, 07:00pm
NOW until 7:00pm Tue
Heat Advisory
Today
High: 98 °F
Hot
Tonight
Low: 74 °F
Mostly Clear
Tuesday
High: 97 °F
Chance
T-stormsTuesday Night
Low: 73 °F
Chance
T-stormsWednesday
High: 92 °F
Chance
T-stormsWednesday Night
Low: 66 °F
Partly Cloudy
Thursday
High: 89 °F
Sunny
Thursday Night
Low: 66 °F
Mostly Clear
Detailed Forecast
Today
Sunny and hot, with a high near 98. South southeast wind around 6 mph becoming calm in the afternoon.
Tonight
Mostly clear, with a low around 74. East southeast wind around 5 mph becoming calm in the evening.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind becoming northwest around 6 mph in the afternoon.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light north northwest wind.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92. Light north wind increasing to 5 to 10 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 66. North northeast wind 6 to 9 mph.
Thursday
Sunny, with a high near 89. North northeast wind 6 to 10 mph.
Thursday Night
Mostly clear, with a low around 66. North northeast wind 5 to 8 mph becoming calm in the evening.
Friday
Sunny, with a high near 91. Calm wind becoming north 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 66. North wind around 6 mph becoming calm in the evening.
Saturday
Sunny, with a high near 91. Calm wind becoming north northwest 5 to 8 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 63. North northwest wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 85. Light north wind becoming north northwest 5 to 10 mph in the morning.
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
2 Miles ENE Saint Johns IL
38.03°N 89.19°W
38.03°N 89.19°W
5:46 am CDT Aug 18, 2025
9am CDT Aug 18, 2025-6pm CDT Aug 24, 2025
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