Forecast

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

    Collinsville, IL

    Updated: 2:56 PM CDT

    29°F

    Chance Snow Showers

    22 mph NW
    Precipitation: 14%

    A chance of snow showers. Mostly cloudy, with a high near 29. Northwest wind around 22 mph, with gusts as high as 33 mph.

    Hourly Forecast

    MON16:00
    29°F
    Chance Snow Showers
    Dewpoint:-9.4°Precip:14%Humidity:55%Wind:22 mph W
    MON17:00
    29°F
    Chance Snow Showers
    Dewpoint:-9.4°Precip:14%Humidity:55%Wind:21 mph NW
    MON18:00
    28°F
    Chance Snow Showers
    Dewpoint:-10°Precip:14%Humidity:55%Wind:20 mph NW
    TUE19:00
    27°F
    Mostly Cloudy
    Dewpoint:-10°Precip:1%Humidity:57%Wind:20 mph NW
    TUE20:00
    25°F
    Mostly Cloudy
    Dewpoint:-10.6°Precip:2%Humidity:60%Wind:17 mph NW
    TUE21:00
    25°F
    Mostly Cloudy
    Dewpoint:-11.1°Precip:0%Humidity:57%Wind:17 mph NW
    TUE22:00
    25°F
    Cloudy
    Dewpoint:-11.7°Precip:0%Humidity:55%Wind:16 mph NW
    TUE23:00
    24°F
    Mostly Cloudy
    Dewpoint:-12.2°Precip:0%Humidity:54%Wind:16 mph NW
    TUE00:00
    22°F
    Mostly Cloudy
    Dewpoint:-13.3°Precip:0%Humidity:54%Wind:16 mph NW
    TUE01:00
    21°F
    Mostly Cloudy
    Dewpoint:-14.4°Precip:0%Humidity:52%Wind:15 mph NW
    TUE02:00
    20°F
    Mostly Cloudy
    Dewpoint:-14.4°Precip:0%Humidity:54%Wind:15 mph NW
    TUE03:00
    19°F
    Mostly Cloudy
    Dewpoint:-14.4°Precip:0%Humidity:56%Wind:14 mph NW
    TUE04:00
    18°F
    Mostly Cloudy
    Dewpoint:-15°Precip:0%Humidity:56%Wind:13 mph NW
    TUE05:00
    17°F
    Mostly Cloudy
    Dewpoint:-15°Precip:0%Humidity:58%Wind:13 mph NW
    TUE06:00
    17°F
    Partly Sunny
    Dewpoint:-15.6°Precip:0%Humidity:56%Wind:12 mph NW
    TUE07:00
    16°F
    Mostly Sunny
    Dewpoint:-15.6°Precip:0%Humidity:58%Wind:10 mph NW
    TUE08:00
    17°F
    Mostly Sunny
    Dewpoint:-15.6°Precip:0%Humidity:56%Wind:9 mph NW
    TUE09:00
    18°F
    Sunny
    Dewpoint:-15.6°Precip:0%Humidity:53%Wind:9 mph NW
    TUE10:00
    21°F
    Sunny
    Dewpoint:-15°Precip:0%Humidity:49%Wind:9 mph NW
    TUE11:00
    23°F
    Sunny
    Dewpoint:-14.4°Precip:0%Humidity:47%Wind:9 mph W
    TUE12:00
    26°F
    Sunny
    Dewpoint:-13.9°Precip:0%Humidity:44%Wind:8 mph W
    TUE13:00
    27°F
    Mostly Sunny
    Dewpoint:-13.9°Precip:0%Humidity:42%Wind:7 mph W
    TUE14:00
    30°F
    Mostly Sunny
    Dewpoint:-13.3°Precip:0%Humidity:39%Wind:7 mph W
    TUE15:00
    33°F
    Mostly Sunny
    Dewpoint:-13.3°Precip:1%Humidity:34%Wind:7 mph SW

    Extended Forecast

    Tonight

    Mon, Mar 16
    16°F
    Chance Snow Showers then Mostly Cloudy
    13 mph NW
    Precipitation: 14%
    A chance of snow showers before 7pm. Mostly cloudy, with a low around 16. Northwest wind 13 to 20 mph, with gusts as high as 29 mph.

    Tuesday

    Tue, Mar 17
    35°F
    Mostly Sunny
    6 mph W
    Precipitation: 3%
    Mostly sunny, with a high near 35. West wind 6 to 12 mph.

    Tuesday Night

    Tue, Mar 17
    32°F
    Chance Light Snow
    7 mph S
    Precipitation: 42%
    A chance of snow between 7pm and 4am, then a chance of rain. Mostly cloudy, with a low around 32. South wind 7 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 40%.

    Wednesday

    Wed, Mar 18
    64°F
    Chance Light Rain then Mostly Sunny
    8 mph SW
    Precipitation: 38%
    A chance of rain before 7am. Mostly sunny, with a high near 64. Southwest wind 8 to 12 mph. Chance of precipitation is 40%.

    Wednesday Night

    Wed, Mar 18
    43°F
    Mostly Cloudy
    6 mph SW
    Precipitation: 0%
    Mostly cloudy, with a low around 43.

    Thursday

    Thu, Mar 19
    72°F
    Mostly Sunny
    7 mph SW
    Precipitation: 1%
    Mostly sunny, with a high near 72.

    Thursday Night

    Thu, Mar 19
    48°F
    Partly Cloudy
    6 mph E
    Precipitation: 0%
    Partly cloudy, with a low around 48.

    Friday

    Fri, Mar 20
    77°F
    Mostly Sunny
    3 mph SW
    Precipitation: 0%
    Mostly sunny, with a high near 77.

    Friday Night

    Fri, Mar 20
    53°F
    Partly Cloudy
    7 mph SW
    Precipitation: 1%
    Partly cloudy, with a low around 53.

    Saturday

    Sat, Mar 21
    78°F
    Mostly Sunny
    9 mph W
    Precipitation: 0%
    Mostly sunny, with a high near 78.

    Saturday Night

    Sat, Mar 21
    51°F
    Mostly Clear
    8 mph SW
    Precipitation: 0%
    Mostly clear, with a low around 51.

    Sunday

    Sun, Mar 22
    72°F
    Sunny
    8 mph NW
    Precipitation: 0%
    Sunny, with a high near 72.

    Sunday Night

    Sun, Mar 22
    41°F
    Partly Cloudy
    12 mph N
    Precipitation: 5%
    Partly cloudy, with a low around 41.

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