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

74°F

23°C

Humidity 100%
Wind Speed Calm
Barometer 30.05 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Last update 18 Aug 3:15 am CDT
Extended Forecast for

4 Miles SSE Altamont IL

Heat Advisory August 18, 03:40am until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 18, 03:40am until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Overnight

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 91. Heat index values as high as 102. Calm wind becoming south southeast around 5 mph.

    High: 91 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. Calm wind.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 91. Heat index values as high as 100. Calm wind becoming west southwest around 5 mph. Chance of precipitation is 40%.

    High: 91 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 85. North northeast wind 3 to 7 mph.

    High: 85 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 64. North northeast wind around 6 mph.

    Low: 64 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

Detailed Forecast

Overnight
Partly cloudy, with a low around 73. Calm wind.
Monday
Mostly sunny, with a high near 91. Heat index values as high as 102. Calm wind becoming south southeast around 5 mph.
Monday Night
Mostly clear, with a low around 73. Calm wind.
Tuesday
A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 91. Heat index values as high as 100. Calm wind becoming west southwest around 5 mph. Chance of precipitation is 40%.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. Calm wind.
Wednesday
Mostly sunny, with a high near 85. North northeast wind 3 to 7 mph.
Wednesday Night
Mostly clear, with a low around 64. North northeast wind around 6 mph.
Thursday
Sunny, with a high near 85.
Thursday Night
Mostly clear, with a low around 63.
Friday
Sunny, with a high near 86.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 86.
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:
4 Miles SSE Altamont IL
 39.01°N 88.7°W (Elev. 574 ft)
Last Update:
3:25 am CDT Aug 18, 2025
Forecast Valid:
3am 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