Hazardous Weather Conditions
Current conditions at
Marion - Williamson County Regional Airport (KMWA)
Lat: 37.77°NLon: 89.01°WElev: 486ft.
Fair
81°F
27°C
| Humidity | 70% |
| Wind Speed | E 8 mph |
| Barometer | 30.05 in |
| Dewpoint | 70°F (21°C) |
| Visibility | 10.00 mi |
| Heat Index | 85°F (29°C) |
| Last update | 18 Sep 9:55 pm CDT |
Extended Forecast for
Marion IL
Heat Advisory September 18, 10:08pm until September 20, 07:00pm
NOW until 7:00pm Sun
Heat Advisory
Tonight
Low: 72 °F
Mostly Clear
Saturday
High: 99 °F
Hot
Saturday Night
Low: 73 °F
Partly Cloudy
Sunday
High: 98 °F
Hot
Sunday Night
Low: 70 °F
Partly Cloudy
Monday
High: 89 °F
Mostly Cloudy
then Chance
T-stormsMonday Night
Low: 63 °F
Chance
ShowersTuesday
High: 77 °F
Partly Sunny
Detailed Forecast
Tonight
Mostly clear, with a low around 72. Calm wind.
Saturday
Sunny and hot, with a high near 99. Calm wind becoming west southwest 5 to 7 mph in the morning.
Saturday Night
Partly cloudy, with a low around 73. Calm wind becoming southwest around 5 mph after midnight.
Sunday
Sunny and hot, with a high near 98. West wind 3 to 8 mph.
Sunday Night
Partly cloudy, with a low around 70. Calm wind.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. Light north northeast wind becoming north 5 to 9 mph in the morning.
Monday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 63. North northeast wind 5 to 10 mph.
Tuesday
Partly sunny, with a high near 77. North wind 8 to 11 mph.
Tuesday Night
Partly cloudy, with a low around 58. North wind 5 to 11 mph.
Wednesday
Partly sunny, with a high near 76. North wind 6 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 56. North wind 5 to 7 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 77. Calm wind becoming north 5 to 9 mph in the morning.
Thursday Night
Partly cloudy, with a low around 58. North northeast wind 5 to 7 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 77. Light north northeast wind increasing to 5 to 9 mph in the morning.
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Marion IL
37.73°N 88.95°W
37.73°N 88.95°W
9:01 pm CDT Sep 18, 2026
10pm CDT Sep 18, 2026-6pm CDT Sep 25, 2026
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