Hazardous Weather Conditions
Current conditions at
Marion - Williamson County Regional Airport (KMWA)
Lat: 37.77°NLon: 89.01°WElev: 486ft.
Fair
90°F
32°C
| Humidity | 63% |
| Wind Speed | W 6 mph |
| Barometer | 30.07 in |
| Dewpoint | 75°F (24°C) |
| Visibility | 10.00 mi |
| Heat Index | 101°F (38°C) |
| Last update | 16 Aug 10:45 am CDT |
Extended Forecast for
2 Miles N Johnston City IL
Extreme Heat Warning August 16, 11:41am until August 16, 08:00pm
NOW until 8:00pm Sun
Extreme Heat Warning
Today
High: 98 °F
Slight Chance
T-stormsTonight
Low: 73 °F
Chance
T-stormsMonday
High: 89 °F
Slight Chance
T-storms then
Mostly SunnyMonday Night
Low: 67 °F
Mostly Clear
Tuesday
High: 92 °F
Sunny
Tuesday Night
Low: 71 °F
Mostly Clear
then Slight
Chance
T-stormsWednesday
High: 93 °F
Chance
ShowersWednesday Night
Low: 69 °F
Chance
T-storms then
Showers
Likely
Detailed Forecast
Today
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 98. Heat index values as high as 107. West southwest wind around 8 mph.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 73. Light and variable wind.
Monday
A slight chance of thunderstorms before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 89. North northwest wind 3 to 8 mph. Chance of precipitation is 10%.
Monday Night
Mostly clear, with a low around 67. North wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 92. Calm wind.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 71. Calm wind.
Wednesday
A 50 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 93. Calm wind becoming south southwest 5 to 8 mph in the morning.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. North wind 3 to 7 mph.
Thursday
A chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 85. North northeast wind 3 to 8 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 65. Northeast wind around 6 mph becoming calm in the evening.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 86. Calm wind becoming north 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 64. Light north northeast wind.
Saturday
Mostly sunny, with a high near 87. Calm wind becoming north northwest 5 to 7 mph in the morning.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
2 Miles N Johnston City IL
37.85°N 88.94°W
37.85°N 88.94°W
9:16 am CDT Aug 16, 2026
11am CDT Aug 16, 2026-6pm CDT Aug 22, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
