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.

Mostly Cloudy

44°F

7°C

Humidity 62%
Wind Speed N 3 mph
Barometer 30.30 in
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 20 Apr 2:15 am CDT
Extended Forecast for

Altamont IL

Frost Advisory until April 20, 08:00am
Click here for hazard details and duration
Frost Advisory
  •  
    Frost Advisory until April 20, 08:00am

    NOW until 8:00am Mon

    Frost Advisory

  • Overnight

    Low: 36 °F

    Areas Frost

  • Monday

    Monday: Areas of frost before 7am. Otherwise, sunny, with a high near 63. Light and variable wind becoming east northeast around 5 mph.

    High: 63 °F

    Areas Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47. South southeast wind 5 to 8 mph, with gusts as high as 17 mph.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Southwest wind 8 to 17 mph, with gusts as high as 26 mph.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 56. South southwest wind 9 to 11 mph, with gusts as high as 22 mph.

    Low: 56 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 76. Southwest wind around 9 mph, with gusts as high as 16 mph.

    High: 76 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56. South wind around 7 mph.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

Overnight
Areas of frost after 5am. Otherwise, partly cloudy, with a low around 36. North northeast wind 3 to 5 mph.
Monday
Areas of frost before 7am. Otherwise, sunny, with a high near 63. Light and variable wind becoming east northeast around 5 mph.
Monday Night
Mostly clear, with a low around 47. South southeast wind 5 to 8 mph, with gusts as high as 17 mph.
Tuesday
Mostly sunny, with a high near 77. Southwest wind 8 to 17 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly clear, with a low around 56. South southwest wind 9 to 11 mph, with gusts as high as 22 mph.
Wednesday
Sunny, with a high near 76. Southwest wind around 9 mph, with gusts as high as 16 mph.
Wednesday Night
Mostly clear, with a low around 56. South wind around 7 mph.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Friday
Showers, with thunderstorms also possible after 1pm. High near 73. Chance of precipitation is 80%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 71.
Saturday Night
A chance of showers. Partly cloudy, with a low around 49.
Sunday
Mostly sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Altamont IL
 39.06°N 88.73°W (Elev. 600 ft)
Last Update:
2:01 am CDT Apr 20, 2026
Forecast Valid:
2am CDT Apr 20, 2026-6pm CDT Apr 26, 2026
 
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