


Hazardous Weather Conditions
Current conditions at
Marion - Williamson County Regional Airport (KMWA)
Lat: 37.77°NLon: 89.01°WElev: 486ft.
Overcast
81°F
27°C
Humidity | 84% |
Wind Speed | S 16 mph |
Barometer | 29.88 in |
Dewpoint | 75°F (24°C) |
Visibility | 10.00 mi |
Heat Index | 87°F (31°C) |
Last update | 18 Jun 8:45 am CDT |
Extended Forecast for
Simpson IL
Lake Wind Advisory June 18, 11:00am until June 18, 07:00pm
Today
High: 89 °F
Slight Chance
T-storms then
Severe
ThunderstormsTonight
Low: 70 °F
Severe
ThunderstormsJuneteenth
High: 86 °F
Mostly Sunny
Thursday Night
Low: 67 °F
Mostly Clear
Friday
High: 89 °F
Sunny
Friday Night
Low: 71 °F
Clear
Saturday
High: 92 °F
Sunny
Saturday Night
Low: 75 °F
Mostly Clear
Sunday
High: 93 °F
Sunny
Detailed Forecast
Today
Showers and thunderstorms likely, mainly after 3pm. Some of the storms could be severe. Partly sunny, with a high near 89. South southwest wind 10 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 70%.
Tonight
Showers and thunderstorms before 4am, then a slight chance of showers. Some of the storms could be severe. Low around 70. Southwest wind 5 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.
Juneteenth
Mostly sunny, with a high near 86. Northwest wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 67. Calm wind.
Friday
Sunny, with a high near 89. Calm wind becoming south around 5 mph in the afternoon.
Friday Night
Clear, with a low around 71. Light south wind.
Saturday
Sunny, with a high near 92. South southwest wind 3 to 8 mph.
Saturday Night
Mostly clear, with a low around 75. South wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 93. Calm wind becoming south southwest around 6 mph in the morning.
Sunday Night
Clear, with a low around 75. Light south wind.
Monday
A slight chance of showers and thunderstorms. Sunny, with a high near 94. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 74. Calm wind.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 93. Light south wind.
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ABOUT THIS FORECAST
Point Forecast:
Simpson IL
37.46°N 88.77°W
37.46°N 88.77°W
7:31 am CDT Jun 18, 2025
9am CDT Jun 18, 2025-6pm CDT Jun 24, 2025