National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Effingham, Effingham County Memorial Airport (K1H2)

Lat: 39.07°NLon: 88.53°WElev: 587ft.

Partly Cloudy

76°F

24°C

Humidity 100%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 76°F (24°C)
Visibility 7.00 mi
Heat Index75°F (24°C)
Last update 16 Aug 6:35 am CDT
Extended Forecast for

Mason IL

Heat Advisory August 16, 07:01am until August 16, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 16, 07:01am until August 16, 08:00pm

    NOW until 8:00pm Sun

    Heat Advisory

  • Today

    High: 89 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 4am, then a slight chance of showers. Partly cloudy, with a low around 70. Light northwest wind. Chance of precipitation is 40%.

    Low: 70 °F

    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 84. North northwest wind 5 to 8 mph.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 64. North wind around 6 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86. Calm wind.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear
    then Chance
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers before 1pm. Partly sunny, with a high near 85. Calm wind becoming northwest around 6 mph in the morning.

    High: 85 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Mostly cloudy, with a high near 89. Heat index values as high as 102. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 17 mph.
Tonight
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Partly cloudy, with a low around 70. Light northwest wind. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 84. North northwest wind 5 to 8 mph.
Monday Night
Mostly clear, with a low around 64. North wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 86. Calm wind.
Tuesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 68. Calm wind.
Wednesday
A 50 percent chance of showers before 1pm. Partly sunny, with a high near 85. Calm wind becoming northwest around 6 mph in the morning.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Thursday
Partly sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 62.
Friday
Mostly sunny, with a high near 81.
Friday Night
Partly cloudy, with a low around 63.
Saturday
Mostly sunny, with a high near 83.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mason IL
 38.94°N 88.62°W (Elev. 564 ft)
Last Update:
6:36 am CDT Aug 16, 2026
Forecast Valid:
7am CDT Aug 16, 2026-6pm CDT Aug 22, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation