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.

Fair

92°F

33°C

Humidity 58%
Wind Speed SE 6 mph
Barometer 30.05 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index103°F (39°C)
Last update 18 Aug 2:55 pm CDT
Extended Forecast for

Mason IL

Heat Advisory August 18, 03:19pm until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 18, 03:19pm until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • This Afternoon

    High: 91 °F

    Sunny

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 72. Southeast wind around 7 mph.

    Low: 72 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly sunny, with a high near 92. Heat index values as high as 103. Southwest wind around 8 mph becoming west northwest in the afternoon.

    High: 92 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 70. Calm wind. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84. North northeast wind 3 to 8 mph.

    High: 84 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66. North northeast wind 5 to 7 mph.

    Low: 66 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 85. Northeast wind around 7 mph.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Sunny, with a high near 91. Heat index values as high as 102. South wind around 7 mph.
Tonight
A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 72. Southeast wind around 7 mph.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly sunny, with a high near 92. Heat index values as high as 103. Southwest wind around 8 mph becoming west northwest in the afternoon.
Tuesday Night
A chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 70. Calm wind. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 84. North northeast wind 3 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 66. North northeast wind 5 to 7 mph.
Thursday
Mostly sunny, with a high near 85. Northeast wind around 7 mph.
Thursday Night
Mostly clear, with a low around 64.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 85.
Saturday Night
Mostly clear, with a low around 59.
Sunday
Sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mason IL
 38.94°N 88.62°W (Elev. 564 ft)
Last Update:
2:56 pm CDT Aug 18, 2025
Forecast Valid:
3pm CDT Aug 18, 2025-6pm CDT Aug 24, 2025
 
Forecast Discussion
 
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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