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      Heat Advisory
      until 8:00 PM CDT
      +1 more alert
      Elev 430 ft, 38.496 °N 89.800 °W

      Mascoutah, IL

      Mascoutah Station87°
      Updated: 6:42 PM CDT on September 18, 2026 (GMT -5)
      2 minutes ago
      99°
      72°
      87
      Feels Like 97
      Sunny
      N
      3
      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
        Sat 09/19
        Low 72°f
         15% Precip. / 0 in
        A stray shower or thunderstorm is possible early. Some passing clouds. Low 72F. Winds light and variable.
        Tomorrow
        Sun 09/20
        High 98°f
         12% Precip. / 0 in
        Partly to mostly cloudy. Hot. High 98F. Winds WSW at 5 to 10 mph.
        Tomorrow night
        Sun 09/20
        Low 70°f
         1% Precip. / 0 in
        Partly cloudy. Low near 70F. Winds light and variable.
        Hourly Forecast
        Now
        90°
        7PM
        89°
        7:02PM
        Sunset
        8PM
        85°
        9PM
        83°
        10PM
        81°
        11PM
        79°
        12AM
        79°
        1AM
        77°
        2AM
        76°
        3AM
        76°
        4AM
        75°
        5AM
        74°
        6AM
        74°
        6:44AM
        Sunrise
        7AM
        73°
        8AM
        77°
        9AM
        82°
        10AM
        88°
        11AM
        91°
        12PM
        93°
        1PM
        95°
        2PM
        97°
        3PM
        97°
        4PM
        96°
        5PM
        95°
        6PM
        93°
        Precipitation
        15%
        Pollen
        Ragweed Pollen
        Very High
        Air Quality
        55
        Moderate
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 29.99 in
        2. Visibility 10 miles
        3. Clouds Partly Cloudy
        4. Dew Point73°F
        5. Humidity 58%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KBLV Station History
        Almanac for September 18, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 99°F 83°F 97°F 1953
        4. Low 72°F 56°F 41°F 1981
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.2 in -
        7. Snow 0 in 0 in -
        Almanac for September 19, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 98°F 83°F 97°F
        4. Low 72°F 56°F 36°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:43 AM 7:02 PM
        3. Civil Twilight 6:16 AM 7:28 PM
        4. Nautical Twilight 5:45 AM 7:59PM
        5. Astronomical Twilight 5:14 AM 8:31 PM
        1. Length of Visible Light 13h 11m
        2. Length of Day 12h 18m
        3. Tomorrow will be 2 minutes 29 seconds shorter
        1. Moon 2:28 PM 11:25 PM
        2. First Quarter49% 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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