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      Extreme Heat Warning
      until 8:00 PM CDT
      Elev 558 ft, 38.588 °N 89.899 °W

      O'Fallon, IL

      O'Fallon Station104°
      Updated: 3:38 PM CDT on September 3, 2026 (GMT -5)
      2 minutes ago
      100°
      73°
      104
      Feels Like 117
      Sunny
      N
      9
      Same temperature is expected tomorrow
      50
      50
      575
      90
      50
      7
      0 mph
      50
      50
      50
      50
      50
      50
      Radar · Now
        Hyper-local data from Weather Underground's network of
        400,000+ personal weather stations worldwide
        Tonight
        Fri 09/04
        Low 75°f
         5% Precip. / 0 in
        Clear skies. Low around 75F. Winds SSW at 5 to 10 mph.
        Tomorrow
        Sat 09/05
        High 100°f
         5% Precip. / 0 in
        Sunny, along with a few afternoon clouds. Very hot. High around 100F. Winds light and variable.
        Tomorrow night
        Sat 09/05
        Low 75°f
         8% Precip. / 0 in
        Mostly clear skies. Low around 75F. Winds light and variable.
        Hourly Forecast
        Now
        99°
        4PM
        99°
        5PM
        98°
        6PM
        96°
        7PM
        92°
        7:26PM
        Sunset
        8PM
        88°
        9PM
        85°
        10PM
        83°
        11PM
        82°
        12AM
        81°
        1AM
        80°
        2AM
        79°
        3AM
        78°
        4AM
        77°
        5AM
        76°
        6AM
        76°
        6:31AM
        Sunrise
        7AM
        76°
        8AM
        80°
        9AM
        86°
        10AM
        90°
        11AM
        93°
        12PM
        95°
        1PM
        97°
        2PM
        98°
        3PM
        98°
        Precipitation
        6%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        46
        Good
        UV Index
        4
        Moderate
        Additional Conditions
        1. Pressure 29.89 in
        2. Visibility 10 miles
        3. Clouds Partly Cloudy
        4. Dew Point70°F
        5. Humidity 40%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KBLV Station History
        Almanac for September 3, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 100°F 87°F 98°F 2011
        4. Low 73°F 61°F 44°F 1967
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.6 in -
        7. Snow 0 in 0 in -
        Almanac for September 4, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 100°F 86°F 102°F
        4. Low 73°F 61°F 42°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:30 AM 7:26 PM
        3. Civil Twilight 6:03 AM 7:53 PM
        4. Nautical Twilight 5:31 AM 8:25PM
        5. Astronomical Twilight 4:58 AM 8:58 PM
        1. Length of Visible Light 13h 49m
        2. Length of Day 12h 55m
        3. Tomorrow will be 2 minutes 26 seconds shorter
        1. Moon 10:59 PM 1:43 PM
        2. Waning Gibbous51% of the Moon is Illuminated
        Sep 4
        Waning Half Last Qtr
        Sep 10
        New Moon
        Sep 18
        Waxing Half First Qtr
        Sep 26
        Full Moon
        Precipitation
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