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

Hazardous Weather Conditions

Current conditions at

Fairfield, Fairfield Municipal Airport (KFWC)

Lat: 38.38°NLon: 88.41°WElev: 436ft.

Partly Cloudy

76°F

24°C

Humidity 95%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index75°F (24°C)
Last update 15 Aug 5:35 am CDT
Extended Forecast for

Sims IL

Extreme Heat Warning August 15, 05:54am until August 16, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 15, 05:54am until August 16, 08:00pm

    NOW until 8:00pm Sun

    Extreme Heat Warning

  • Today

    High: 94 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 75. Calm wind becoming southwest around 5 mph after midnight.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 94. Heat index values as high as 106. West wind 5 to 7 mph.

    High: 94 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 71. North northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 71 °F

    Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 86. North northwest wind 3 to 7 mph.

    High: 86 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65. Light north northeast wind.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 87. Calm wind.

    High: 87 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69. Calm wind becoming south around 5 mph after midnight.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Today
A slight chance of showers between 9am and 10am. Mostly sunny, with a high near 94. Heat index values as high as 106. Calm wind becoming south southwest around 6 mph in the morning. Chance of precipitation is 20%.
Tonight
Mostly clear, with a low around 75. Calm wind becoming southwest around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 94. Heat index values as high as 106. West wind 5 to 7 mph.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. North northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 86. North northwest wind 3 to 7 mph.
Monday Night
Partly cloudy, with a low around 65. Light north northeast wind.
Tuesday
Sunny, with a high near 87. Calm wind.
Tuesday Night
Mostly clear, with a low around 69. Calm wind becoming south around 5 mph after midnight.
Wednesday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 91. South southeast wind 5 to 13 mph becoming west northwest in the afternoon.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67. North wind 5 to 10 mph.
Thursday
A slight chance of showers. Mostly sunny, with a high near 83. North northeast wind 3 to 7 mph.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 61. Northeast wind 3 to 7 mph.
Friday
A slight chance of showers. Mostly sunny, with a high near 82. Northeast wind 3 to 6 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sims IL
 38.37°N 88.54°W
Last Update:
5:26 am CDT Aug 15, 2026
Forecast Valid:
5am CDT Aug 15, 2026-6pm CDT Aug 21, 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