Mason, Illinois Weather
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Weather Forecast for Mason, Illinois : Union County
Issued: 11:46 am CDT Sep 16, 2025 Latitude: 37.5236608 Longitude: -89.2542515 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Wednesday Thursday Friday Saturday Sunday Monday
Sunny on Today Mostly Clear on Tonight Sunny on Wednesday Sunny on Thursday 20% chance of thunderstorms on Friday 20% chance of thunderstorms on Saturday 20% chance of thunderstorms on Sunday 20% chance of thunderstorms on Monday
High: 92°F Low: 66°F High: 92°F High: 93°F High: 89°F High: 84°F High: 84°F High: 84°F
Low: 65°F Low: 66°F Low: 65°F Low: 65°F Low: 66°F  
Sunny Mostly Clear Sunny Sunny Thunderstorms Thunderstorms Thunderstorms Thunderstorms
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Current Conditions at
CARBONDALE - (KMDH)
82°
Clear
as of 10:52 AM CDST
Rel. Humidity: 58%
Dew Point: 66°F
Visibility: 10 Miles
Pressure: 30.14 in.
Flight Rule: VFR
Wind Data
3 MPH
Cloud Level(s): Clear
Current Conditions at
CAPE GIRARDEAU - (KCGI)
86°
Feels like 89°F
Clear
as of 10:53 AM CDST
Rel. Humidity: 55%
Dew Point: 68°F
Visibility: 10 Miles
Pressure: 30.13 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
CAIRO - (KCIR)
86°
Feels like 90°F
Clear
as of 11:35 AM CDST
Rel. Humidity: 58%
Dew Point: 70°F
Visibility: 10 Miles
Pressure: 30.13 in.
Flight Rule: VFR
Wind Data
3 MPH
260° West
Cloud Level(s): Clear
Sunny on Today Today... Sunny, with a high near 92. Calm wind becoming north northeast around 5 mph in the afternoon.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 66. Light east wind.
Sunny on Wednesday Wednesday... Sunny, with a high near 92. Calm wind becoming north northeast around 5 mph in the afternoon.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 65. Calm wind.
Sunny on Thursday Thursday... Sunny, with a high near 93. Calm wind becoming south around 5 mph.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 66. Calm wind.
20% chance of thunderstorms Friday Friday... A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. Calm wind becoming south around 6 mph in the afternoon.
20% chance of thunderstorms Friday Night Friday Night... A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Calm wind.
20% chance of thunderstorms Saturday Saturday... A chance of showers and thunderstorms. Mostly sunny, with a high near 84. Calm wind becoming south southwest around 6 mph in the afternoon.
10% chance of rain Saturday Night Saturday Night... A slight chance of showers. Partly cloudy, with a low around 65. Calm wind.
20% chance of thunderstorms Sunday Sunday... A chance of showers and thunderstorms. Mostly sunny, with a high near 84. Calm wind becoming south 5 to 7 mph in the morning.
20% chance of rain Sunday Night Sunday Night... A chance of showers. Partly cloudy, with a low around 66. South southeast wind 3 to 5 mph.
20% chance of thunderstorms Monday Monday... A chance of showers and thunderstorms. Partly sunny, with a high near 84. South wind 3 to 7 mph.
Current Radar Image


Sun Almanac for Mason, Illinois
Sunrise: 06:40 AM
Sunset: 7:03 PM
Civil Sunrise:06:14 AM
Civil Sunset: 7:29 PM
Nautical Sunrise: 05:43 AM
Nautical Sunset: 8:00 PM
Astro Sunrise: 05:12 AM
Astro Sunset: 8:31 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.