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

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fog/Mist

59°F

15°C

Humidity 96%
Wind Speed S 14 mph
Barometer 29.73 in (1006.6 mb)
Dewpoint 58°F (14°C)
Visibility 5.00 mi
Last update 26 Dec 3:54 am CST
Extended Forecast for

4 Miles N Forsyth IL

  • Overnight

    Overnight: A slight chance of drizzle. Patchy fog. Otherwise, mostly cloudy, with a steady temperature around 57. South wind around 13 mph, with gusts as high as 20 mph.

    Low: 57 °F

    Slight Chance
    Drizzle and
    Patchy Fog

  • Friday

    Friday: Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 61. South southwest wind 9 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph.

    High: 61 °F

    Patchy Fog
    then Partly
    Sunny

  • Friday Night

    Friday Night: Patchy fog after 8pm. Otherwise, mostly cloudy, with a low around 40. Northwest wind 5 to 8 mph becoming light and variable.

    Low: 40 °F

    Patchy Fog

  • Saturday

    Saturday: Mostly cloudy, with a high near 54. Southeast wind 7 to 15 mph, with gusts as high as 21 mph.

    High: 54 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 50 percent chance of rain after midnight. Cloudy, with a temperature rising to around 60 by 5am. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.

    Low: 54 °F⇑

    Cloudy then
    Chance Rain

  • Sunday

    Sunday: Rain before noon, then showers after noon. High near 64. South southwest wind 10 to 16 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 64 °F

    Rain

  • Sunday Night

    Sunday Night: Rain showers likely before 9pm, then rain and snow likely between 9pm and midnight. Mostly cloudy, with a low around 17. Blustery, with a west northwest wind 16 to 21 mph increasing to 24 to 29 mph after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 17 °F

    Blustery.
    Rain/Snow
    Likely then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 25. Blustery.

    High: 25 °F

    Mostly Sunny
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 15.

    Low: 15 °F

    Mostly Clear

Detailed Forecast

Overnight
A slight chance of drizzle. Patchy fog. Otherwise, mostly cloudy, with a steady temperature around 57. South wind around 13 mph, with gusts as high as 20 mph.
Friday
Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 61. South southwest wind 9 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph.
Friday Night
Patchy fog after 8pm. Otherwise, mostly cloudy, with a low around 40. Northwest wind 5 to 8 mph becoming light and variable.
Saturday
Mostly cloudy, with a high near 54. Southeast wind 7 to 15 mph, with gusts as high as 21 mph.
Saturday Night
A 50 percent chance of rain after midnight. Cloudy, with a temperature rising to around 60 by 5am. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Sunday
Rain before noon, then showers after noon. High near 64. South southwest wind 10 to 16 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Rain showers likely before 9pm, then rain and snow likely between 9pm and midnight. Mostly cloudy, with a low around 17. Blustery, with a west northwest wind 16 to 21 mph increasing to 24 to 29 mph after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Mostly sunny, with a high near 25. Blustery.
Monday Night
Mostly clear, with a low around 15.
Tuesday
Sunny, with a high near 31.
Tuesday Night
Partly cloudy, with a low around 22.
Wednesday
Mostly sunny, with a high near 33.
Wednesday Night
Partly cloudy, with a low around 15.
New Year's Day
Mostly sunny, with a high near 29.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Forsyth IL
 39.97°N 88.96°W (Elev. 679 ft)
Last Update:
3:16 am CST Dec 26, 2025
Forecast Valid:
4am CST Dec 26, 2025-6pm CST Jan 1, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation