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      Elev 164 ft, 38.729 °N 90.694 °W

      O'Fallon, MO

      O'Fallon Station78°
      Updated: 9:37 AM CDT on September 12, 2026 (GMT -5)
      10 minutes ago
      91°
      66°
      78
      Feels Like 79
      Sunny
      N
      6
      Higher 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
        Sun 09/13
        High 91°f
         2% Precip. / 0 in
        A good deal of sunshine. High 91F. Winds WNW at 5 to 10 mph.
        Tonight
        Sun 09/13
        Low 67°f
         24% Precip. / 0 in
        A few passing clouds. A stray shower or thunderstorm is possible. Low 67F. Winds light and variable.
        Tomorrow
        Mon 09/14
        High 83°f62°f
         41% Precip. / 0.04 in
        Cloudy in the morning with scattered thunderstorms developing later in the day. High 83F. Winds N at 5 to 10 mph. Chance of rain 40%.
        Hourly Forecast
        Now
        79°
        10AM
        80°
        11AM
        83°
        12PM
        85°
        1PM
        86°
        2PM
        88°
        3PM
        89°
        4PM
        89°
        5PM
        88°
        6PM
        87°
        7PM
        83°
        7:15PM
        Sunset
        8PM
        80°
        9PM
        78°
        10PM
        76°
        11PM
        74°
        12AM
        73°
        1AM
        72°
        2AM
        70°
        3AM
        70°
        4AM
        70°
        5AM
        69°
        6AM
        68°
        6:42AM
        Sunrise
        7AM
        68°
        8AM
        34%
        70°
        9AM
        72°
        Precipitation
        34%
        Pollen
        Ragweed Pollen
        Very High
        Air Quality
        55
        Moderate
        UV Index
        3
        Moderate
        Additional Conditions
        1. Pressure 29.9 in
        2. Visibility 10 miles
        3. Clouds Clear
        4. Dew Point70°F
        5. Humidity 76%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KSUS Station History
        Almanac for September 12, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 91°F 81°F 97°F 2013
        4. Low 66°F 59°F 41°F 1968
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.3 in -
        7. Snow 0 in 0 in -
        Almanac for September 13, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 83°F 81°F 95°F
        4. Low 66°F 58°F 40°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:41 AM 7:15 PM
        3. Civil Twilight 6:14 AM 7:42 PM
        4. Nautical Twilight 5:43 AM 8:13PM
        5. Astronomical Twilight 5:10 AM 8:46 PM
        1. Length of Visible Light 13h 27m
        2. Length of Day 12h 33m
        3. Tomorrow will be 2 minutes 28 seconds shorter
        1. Moon 8:18 AM 7:50 PM
        2. Waxing Crescent2% of the Moon is Illuminated
        Sep 18
        Waxing Half First Qtr
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        Oct 10
        New Moon
        Precipitation
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