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.

Fair

73°F

23°C

Humidity 87%
Wind Speed S 5 mph
Barometer 30.08 in
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 9 Sep 5:55 am CDT
Extended Forecast for

Sims IL

Heat Advisory September 9, 11:00am until September 9, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny and hot, with a high near 99. South wind 5 to 11 mph becoming west in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 30%.

    High: 99 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 70. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 70 °F

    Chance
    T-storms then
    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. High near 83. Calm wind becoming west northwest around 6 mph in the afternoon. Chance of precipitation is 80%.

    High: 83 °F

    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A slight chance of thunderstorms before 7pm. Mostly cloudy, with a low around 63. Light north northeast wind. Chance of precipitation is 10%.

    Low: 63 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 86. Light east southeast wind.

    High: 86 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 30%.

    High: 91 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon.

    High: 91 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny and hot, with a high near 99. South wind 5 to 11 mph becoming west in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 30%.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 70. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Thursday
Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. High near 83. Calm wind becoming west northwest around 6 mph in the afternoon. Chance of precipitation is 80%.
Thursday Night
A slight chance of thunderstorms before 7pm. Mostly cloudy, with a low around 63. Light north northeast wind. Chance of precipitation is 10%.
Friday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 86. Light east southeast wind.
Friday Night
Partly cloudy, with a low around 65. Calm wind.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 30%.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67. Calm wind.
Sunday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 68. Light south southeast wind.
Monday
Sunny, with a high near 94. Light south wind becoming south southwest 6 to 11 mph in the morning.
Monday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 69. South wind 5 to 8 mph.
Tuesday
A chance of showers and thunderstorms. Sunny, with a high near 91. West wind 5 to 9 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:
6:01 am CDT Sep 9, 2026
Forecast Valid:
6am CDT Sep 9, 2026-6pm CDT Sep 15, 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