My Profile
  1. Member Settings
  2. My Devices
  3. Sign Out
Log In
    Favorites
        More Settings
      Elev 2044 ft, 38.526 °N 122.553 °W

      St. Helena, CA

      Saint Helena Station55°
      Updated: 11:24 PM PDT on September 4, 2026 (GMT -7)
      10 minutes ago
      75°
      53°
      55
      Feels Like 55
      Clear
      N
      3
      Higher 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 09/05
        Low 49°f
         4% Precip. / 0 in
        Clear skies. Low 49F. Winds light and variable.
        Tomorrow
        Sun 09/06
        High 78°f
         6% Precip. / 0 in
        Mainly sunny. High 78F. Winds S at 5 to 10 mph.
        Tomorrow night
        Sun 09/06
        Low 49°f
         10% Precip. / 0 in
        Mostly clear. Low 49F. Winds WSW at 5 to 10 mph.
        Hourly Forecast
        Now
        55°
        12AM
        54°
        1AM
        52°
        2AM
        50°
        3AM
        48°
        4AM
        47°
        5AM
        46°
        6AM
        46°
        6:43AM
        Sunrise
        7AM
        51°
        8AM
        55°
        9AM
        60°
        10AM
        65°
        11AM
        69°
        12PM
        72°
        1PM
        74°
        2PM
        77°
        3PM
        77°
        4PM
        77°
        5PM
        76°
        6PM
        74°
        7PM
        70°
        7:33PM
        Sunset
        8PM
        65°
        9PM
        63°
        10PM
        60°
        11PM
        58°
        Precipitation
        7%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        28
        Good
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 29.96 in
        2. Visibility 9 miles
        3. Clouds Partly Cloudy
        4. Dew Point48°F
        5. Humidity 77%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KSTS Station History
        Almanac for September 5, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 75°F 88°F 111°F 2022
        4. Low 53°F 55°F 39°F 1933
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.5 in -
        7. Snow 0 in 0 in -
        Almanac for September 6, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 78°F 88°F 113°F
        4. Low 53°F 55°F 43°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:43 AM 7:33 PM
        3. Civil Twilight 6:16 AM 8:00 PM
        4. Nautical Twilight 5:44 AM 8:32PM
        5. Astronomical Twilight 5:11 AM 9:05 PM
        1. Length of Visible Light 13h 44m
        2. Length of Day 12h 50m
        3. Tomorrow will be 2 minutes 26 seconds shorter
        1. Moon 12:13 AM 4:10 PM
        2. Waning Crescent38% of the Moon is Illuminated
        Sep 10
        New Moon
        Sep 18
        Waxing Half First Qtr
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        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