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      Elev 585 ft, 38.819 °N 90.777 °W

      O'Fallon, MO

      O'Fallon Station69°
      Updated: 5:34 AM CDT on September 21, 2026 (GMT -5)
      7 minutes ago
      73°
      64°
      69
      Feels Like 69
      Mostly Cloudy
      N
      1
      Lower temperature is expected today
      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
        Today
        Tue 09/22
        High 73°f
         20% Precip. / 0 in
        Cloudy. A stray shower or thunderstorm is possible. High 73F. Winds NNE at 5 to 10 mph.
        Tonight
        Tue 09/22
        Low 61°f
         9% Precip. / 0 in
        Cloudy. Low 61F. Winds light and variable.
        Tomorrow
        Tue 09/22
        High 69°f55°f
         9% Precip. / 0 in
        Cloudy. High 69F. Winds NNE at 5 to 10 mph.
        Hourly Forecast
        Now
        68°
        6AM
        68°
        6:50AM
        Sunrise
        7AM
        68°
        8AM
        68°
        9AM
        68°
        10AM
        69°
        11AM
        70°
        12PM
        71°
        1PM
        72°
        2PM
        72°
        3PM
        73°
        4PM
        73°
        5PM
        73°
        6PM
        71°
        7PM
        70°
        7:01PM
        Sunset
        8PM
        68°
        9PM
        67°
        10PM
        66°
        11PM
        66°
        12AM
        65°
        1AM
        65°
        2AM
        64°
        3AM
        64°
        4AM
        63°
        5AM
        63°
        Precipitation
        19%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        31
        Good
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 29.95 in
        2. Visibility 10 miles
        3. Clouds Mostly Cloudy
        4. Dew Point68°F
        5. Humidity 100%
        6. Rainfall 1.17 in
        7. Snow Depth 0 in
         KSUS Station History
        Almanac for September 21, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 73°F 78°F 97°F 2022
        4. Low 64°F 55°F 33°F 1991
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.1 in -
        7. Snow 0 in 0 in -
        Almanac for September 22, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 69°F 78°F 93°F
        4. Low 64°F 54°F 31°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:50 AM 7:01 PM
        3. Civil Twilight 6:23 AM 7:28 PM
        4. Nautical Twilight 5:52 AM 7:59PM
        5. Astronomical Twilight 5:20 AM 8:30 PM
        1. Length of Visible Light 13h 4m
        2. Length of Day 12h 11m
        3. Tomorrow will be 2 minutes 30 seconds shorter
        1. Moon 4:36 PM 1:25 AM
        2. Waxing Gibbous77% of the Moon is Illuminated
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        Oct 10
        New Moon
        Oct 18
        Waxing Half First Qtr
        Precipitation
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