Forecast

    Forecast for Decatur, IL | Forecast Periods: 14
    Monday
    Mar 16
    2026

    Decatur, IL

    Updated: 1:26 PM CDT

    24°F

    Patchy Blowing Snow

    25 mph WNW
    Precipitation: 24%

    Patchy blowing snow and a slight chance of snow. Mostly cloudy, with a high near 24. West northwest wind around 25 mph, with gusts as high as 38 mph. Chance of precipitation is 20%.

    Hourly Forecast

    MON15:00
    24°F
    Patchy Blowing Snow
    Dewpoint:-8.3°Precip:24%Humidity:74%Wind:25 mph WNW
    MON16:00
    24°F
    Slight Chance Light Snow
    Dewpoint:-8.3°Precip:23%Humidity:74%Wind:23 mph WNW
    MON17:00
    24°F
    Slight Chance Light Snow
    Dewpoint:-8.3°Precip:15%Humidity:74%Wind:23 mph WNW
    MON18:00
    24°F
    Chance Snow Showers
    Dewpoint:-9.4°Precip:14%Humidity:68%Wind:22 mph WNW
    TUE19:00
    23°F
    Chance Snow Showers
    Dewpoint:-10°Precip:13%Humidity:68%Wind:21 mph WNW
    TUE20:00
    19°F
    Chance Snow Showers
    Dewpoint:-10.6°Precip:12%Humidity:77%Wind:21 mph WNW
    TUE21:00
    18°F
    Chance Snow Showers
    Dewpoint:-11.1°Precip:12%Humidity:77%Wind:21 mph WNW
    TUE22:00
    17°F
    Chance Snow Showers
    Dewpoint:-12.2°Precip:11%Humidity:73%Wind:20 mph WNW
    TUE23:00
    17°F
    Mostly Cloudy
    Dewpoint:-12.8°Precip:8%Humidity:70%Wind:18 mph NW
    TUE00:00
    16°F
    Mostly Cloudy
    Dewpoint:-13.9°Precip:4%Humidity:67%Wind:18 mph WNW
    TUE01:00
    15°F
    Mostly Cloudy
    Dewpoint:-14.4°Precip:0%Humidity:67%Wind:17 mph WNW
    TUE02:00
    14°F
    Mostly Cloudy
    Dewpoint:-14.4°Precip:0%Humidity:70%Wind:16 mph WNW
    TUE03:00
    13°F
    Mostly Cloudy
    Dewpoint:-15°Precip:0%Humidity:70%Wind:16 mph WNW
    TUE04:00
    13°F
    Mostly Cloudy
    Dewpoint:-15°Precip:0%Humidity:70%Wind:15 mph WNW
    TUE05:00
    13°F
    Mostly Cloudy
    Dewpoint:-15°Precip:0%Humidity:70%Wind:15 mph WNW
    TUE06:00
    12°F
    Partly Sunny
    Dewpoint:-15.6°Precip:0%Humidity:70%Wind:14 mph WNW
    TUE07:00
    13°F
    Partly Sunny
    Dewpoint:-15.6°Precip:0%Humidity:67%Wind:13 mph WNW
    TUE08:00
    12°F
    Mostly Sunny
    Dewpoint:-15.6°Precip:0%Humidity:70%Wind:13 mph WNW
    TUE09:00
    14°F
    Mostly Sunny
    Dewpoint:-15.6°Precip:0%Humidity:64%Wind:12 mph WNW
    TUE10:00
    16°F
    Mostly Sunny
    Dewpoint:-15°Precip:0%Humidity:61%Wind:10 mph WNW
    TUE11:00
    19°F
    Mostly Sunny
    Dewpoint:-13.9°Precip:0%Humidity:59%Wind:10 mph WNW
    TUE12:00
    21°F
    Partly Sunny
    Dewpoint:-13.3°Precip:0%Humidity:56%Wind:9 mph WNW
    TUE13:00
    22°F
    Partly Sunny
    Dewpoint:-12.8°Precip:0%Humidity:57%Wind:9 mph W
    TUE14:00
    24°F
    Partly Sunny
    Dewpoint:-12.8°Precip:0%Humidity:52%Wind:8 mph W

    Extended Forecast

    Tonight

    Mon, Mar 16
    12°F
    Chance Snow Showers then Mostly Cloudy
    15 mph WNW
    Precipitation: 14%
    A chance of snow showers before 11pm. Mostly cloudy, with a low around 12. Wind chill values as low as -3. West northwest wind 15 to 22 mph, with gusts as high as 33 mph.

    Tuesday

    Tue, Mar 17
    27°F
    Partly Sunny
    6 mph W
    Precipitation: 1%
    Partly sunny, with a high near 27. Wind chill values as low as -3. West wind 6 to 14 mph, with gusts as high as 22 mph.

    Tuesday Night

    Tue, Mar 17
    24°F
    Light Snow Likely
    6 mph S
    Precipitation: 70%
    Snow likely after 7pm. Cloudy. Low around 24, with temperatures rising to around 30 overnight. South wind 6 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

    Wednesday

    Wed, Mar 18
    53°F
    Light Snow Likely then Mostly Sunny
    9 mph SSW
    Precipitation: 69%
    Snow likely before 7am. Mostly sunny, with a high near 53. South southwest wind 9 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New snow accumulation of less than half an inch possible.

    Wednesday Night

    Wed, Mar 18
    36°F
    Partly Cloudy
    5 mph SW
    Precipitation: 1%
    Partly cloudy, with a low around 36. Southwest wind 5 to 8 mph.

    Thursday

    Thu, Mar 19
    65°F
    Mostly Sunny
    8 mph SW
    Precipitation: 4%
    Mostly sunny, with a high near 65. Southwest wind around 8 mph.

    Thursday Night

    Thu, Mar 19
    42°F
    Partly Cloudy
    7 mph E
    Precipitation: 1%
    Partly cloudy, with a low around 42.

    Friday

    Fri, Mar 20
    71°F
    Mostly Sunny
    6 mph SW
    Precipitation: 0%
    Mostly sunny, with a high near 71.

    Friday Night

    Fri, Mar 20
    47°F
    Mostly Cloudy
    10 mph SSW
    Precipitation: 1%
    Mostly cloudy, with a low around 47.

    Saturday

    Sat, Mar 21
    71°F
    Mostly Sunny
    12 mph WSW
    Precipitation: 1%
    Mostly sunny, with a high near 71.

    Saturday Night

    Sat, Mar 21
    45°F
    Partly Cloudy
    10 mph W
    Precipitation: 2%
    Partly cloudy, with a low around 45.

    Sunday

    Sun, Mar 22
    66°F
    Mostly Sunny
    12 mph NNW
    Precipitation: 3%
    Mostly sunny, with a high near 66.

    Sunday Night

    Sun, Mar 22
    35°F
    Mostly Cloudy
    14 mph N
    Precipitation: 4%
    Mostly cloudy, with a low around 35.

    Display Settings