My Profile
  1. Member Settings
  2. My Devices
  3. Sign Out
Log In
    Favorites
        More Settings
      Heat Advisory
      until 8:00 PM PDT
      Elev 373 ft, 34.113 °N 117.579 °W

      Rancho Cucamonga, CA

      Rancho Cucamonga Station101°
      Updated: 1:49 PM PDT on September 11, 2026 (GMT -7)
      9 minutes ago
      96°
      73°
      101
      Feels Like 107
      Sunny
      N
      9
      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
        Sat 09/12
        High 96°f
         0% Precip. / 0 in
        Sun and clouds mixed. High 96F. Winds WSW at 10 to 20 mph.
        Tonight
        Sat 09/12
        Low 71°f
         5% Precip. / 0 in
        Clear skies. Low 71F. Winds WSW at 10 to 15 mph.
        Tomorrow
        Sun 09/13
        High 94°f67°f
         5% Precip. / 0 in
        Mainly sunny. High 94F. Winds SW at 10 to 15 mph.
        Hourly Forecast
        Now
        95°
        2PM
        95°
        3PM
        96°
        4PM
        95°
        5PM
        92°
        6PM
        90°
        7PM
        87°
        7:02PM
        Sunset
        8PM
        83°
        9PM
        81°
        10PM
        80°
        11PM
        78°
        12AM
        77°
        1AM
        76°
        2AM
        75°
        3AM
        74°
        4AM
        74°
        5AM
        73°
        6AM
        73°
        6:31AM
        Sunrise
        7AM
        72°
        8AM
        74°
        9AM
        77°
        10AM
        81°
        11AM
        84°
        12PM
        87°
        1PM
        90°
        Precipitation
        5%
        Pollen
        None
        Air Quality
        42
        Good
        UV Index
        8
        Very High
        Additional Conditions
        1. Pressure 29.8 in
        2. Visibility 10 miles
        3. Clouds Partly Cloudy
        4. Dew Point60°F
        5. Humidity 32%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KONT Station History
        Almanac for September 11, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 96°F 92°F 112°F 1971
        4. Low 73°F 62°F 48°F 1952
        5. Rain/Snow Depth
        6. Precipitation 0 in 0.01 in -
        7. Snow 0 in - in -
        Almanac for September 12, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 94°F 92°F 115°F
        4. Low 73°F 62°F 48°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:30 AM 7:02 PM
        3. Civil Twilight 6:05 AM 7:27 PM
        4. Nautical Twilight 5:36 AM 7:56PM
        5. Astronomical Twilight 5:05 AM 8:27 PM
        1. Length of Visible Light 13h 21m
        2. Length of Day 12h 31m
        3. Tomorrow will be 2 minutes 5 seconds shorter
        1. Moon 7:04 AM 7:17 PM
        2. Waxing Crescent0% 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
        Loading…
        Health
        Loading…
        Weather Alerts
        Loading…
        Our AppsAbout UsContactCareersWeather Data APIs
        PWS NetworkWundermap
        Terms of UsePrivacy PolicyCookie NoticeAccessibility StatementAdChoicesData Vendors
        essentialaccessibility.com
        We recognize our responsibility to use data and technology for good. We may use or share your data with our data vendors. Take control of your data.
        Review All Privacy and Ad Settings
        Choose how my information is shared
        Data Rights
        The Weather Company The Weather Channel Weather Underground Storm Radar
        © The Weather Company, LLC 2026
        Glossary