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      Heat Advisory
      until 7:00 PM CDT
      Elev 927 ft, 42.245 °N 88.323 °W

      Crystal Lake, IL

      City Hall Station78°
      Updated: 4:51 AM CDT on September 3, 2026 (GMT -5)
      9 minutes ago
      86°
      73°
      78
      Feels Like 79
      Fair
      N
      3
      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
        Fri 09/04
        High 86°f
         24% Precip. / 0 in
        Sunshine and clouds mixed. A stray shower or thunderstorm is possible. High 86F. Winds SSW at 5 to 10 mph.
        Tonight
        Fri 09/04
        Low 71°f
         60% Precip. / 0.29 in
        Mostly clear skies this evening followed by thunderstorms late. Low 71F. Winds SSE at 5 to 10 mph. Chance of rain 60%.
        Tomorrow
        Sat 09/05
        High 87°f69°f
         75% Precip. / 0.18 in
        Cloudy and damp with rain in the morning...then becoming partly cloudy. High 87F. Winds SSW at 5 to 10 mph. Chance of rain 80%.
        Hourly Forecast
        Now
        77°
        5AM
        77°
        6AM
        77°
        6:21AM
        Sunrise
        7AM
        76°
        8AM
        77°
        9AM
        80°
        10AM
        83°
        11AM
        85°
        12PM
        86°
        1PM
        85°
        2PM
        84°
        3PM
        85°
        4PM
        85°
        5PM
        85°
        6PM
        84°
        7PM
        82°
        7:23PM
        Sunset
        8PM
        79°
        9PM
        78°
        10PM
        77°
        11PM
        77°
        12AM
        34%
        75°
        1AM
        35%
        74°
        2AM
        73°
        3AM
        73°
        4AM
        72°
        Precipitation
        35%
        Pollen
        Grass Pollen
        Low
        Air Quality
        68
        Moderate
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 29.9 in
        2. Visibility 10 miles
        3. Clouds Partly Cloudy
        4. Dew Point73°F
        5. Humidity 88%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         K06C Station History
        Almanac for September 3, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 86°F 80°F 93°F 1925
        4. Low 73°F 58°F 45°F 2017
        5. Rain/Snow Depth
        6. Precipitation 0.29 in 3.6 in -
        7. Snow 0 in 0 in -
        Almanac for September 4, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 87°F 80°F 99°F
        4. Low 73°F 57°F 45°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:20 AM 7:23 PM
        3. Civil Twilight 5:52 AM 7:52 PM
        4. Nautical Twilight 5:17 AM 8:26PM
        5. Astronomical Twilight 4:41 AM 9:02 PM
        1. Length of Visible Light 14h 0m
        2. Length of Day 13h 2m
        3. Tomorrow will be 2 minutes 46 seconds shorter
        1. Moon 10:38 PM 1:50 PM
        2. Waning Gibbous52% 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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