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

Fairfield, Fairfield Municipal Airport (KFWC)

Lat: 38.38°NLon: 88.41°WElev: 436ft.

Mostly Cloudy

45°F

7°C

Humidity 49%
Wind Speed SE 5 mph
Barometer 30.34 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 29 Mar 2:55 am CDT
Extended Forecast for

Fairfield IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 38. South southeast wind around 5 mph.

    Low: 38 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 68. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 68 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 55. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 55 °F

    Decreasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 78. Breezy, with a south southwest wind 11 to 21 mph, with gusts as high as 34 mph.

    High: 78 °F

    Partly Sunny
    then Mostly
    Sunny and
    Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64. South southwest wind around 15 mph, with gusts as high as 26 mph.

    Low: 64 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 82. Breezy, with a south southwest wind 14 to 24 mph, with gusts as high as 38 mph.

    High: 82 °F

    Breezy.
    Mostly Sunny
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 53. South southwest wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    Low: 53 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Mostly cloudy, with a high near 64. North northeast wind around 11 mph, with gusts as high as 20 mph.

    High: 64 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 51. Northeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 51 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Overnight
Mostly cloudy, with a low around 38. South southeast wind around 5 mph.
Sunday
Mostly sunny, with a high near 68. South wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 55. South wind 8 to 10 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 78. Breezy, with a south southwest wind 11 to 21 mph, with gusts as high as 34 mph.
Monday Night
Partly cloudy, with a low around 64. South southwest wind around 15 mph, with gusts as high as 26 mph.
Tuesday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 82. Breezy, with a south southwest wind 14 to 24 mph, with gusts as high as 38 mph.
Tuesday Night
A chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 53. South southwest wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 64. North northeast wind around 11 mph, with gusts as high as 20 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 51. Northeast wind around 10 mph, with gusts as high as 20 mph.
Thursday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 67. East southeast wind around 11 mph, with gusts as high as 20 mph.
Thursday Night
Showers likely. Mostly cloudy, with a low around 50. East wind around 8 mph becoming west southwest after midnight.
Friday
A chance of showers. Mostly cloudy, with a high near 74. West wind around 9 mph becoming south in the morning.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. South wind around 8 mph.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 72. South wind 11 to 15 mph, with gusts as high as 22 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Fairfield IL
 38.38°N 88.37°W
Last Update:
1:26 am CDT Mar 29, 2026
Forecast Valid:
3am CDT Mar 29, 2026-6pm CDT Apr 4, 2026
 
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Additional Resources

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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