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      Elev 256 ft, 38.502 °N 122.473 °W

      St. Helena, CA

      St. Helena Station53°
      Updated: 2:25 AM PDT on September 19, 2026 (GMT -7)
      8 minutes ago
      88°
      49°
      53
      Feels Like 53
      Fair
      N
      0
      Similar 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
        Tonight
        Sat 09/19
        Low 51°f
         15% Precip. / 0 in
        Mostly clear. Low 51F. Winds light and variable.
        Tomorrow
        Sun 09/20
        High 89°f
         15% Precip. / 0 in
        Some clouds in the morning will give way to mainly sunny skies for the afternoon. High 89F. Winds SSW at 5 to 10 mph.
        Tomorrow night
        Sun 09/20
        Low 53°f
         6% Precip. / 0 in
        A few clouds from time to time. Low 53F. Winds light and variable.
        Hourly Forecast
        Now
        55°
        3AM
        55°
        4AM
        54°
        5AM
        54°
        6AM
        53°
        6:55AM
        Sunrise
        7AM
        52°
        8AM
        56°
        9AM
        61°
        10AM
        69°
        11AM
        77°
        12PM
        82°
        1PM
        85°
        2PM
        87°
        3PM
        88°
        4PM
        88°
        5PM
        86°
        6PM
        83°
        7PM
        78°
        7:11PM
        Sunset
        8PM
        74°
        9PM
        70°
        10PM
        66°
        11PM
        63°
        12AM
        61°
        1AM
        59°
        2AM
        58°
        Precipitation
        15%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        31
        Good
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 29.99 in
        2. Visibility 10 miles
        3. Clouds Partly Cloudy
        4. Dew Point53°F
        5. Humidity 91%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KSTS Station History
        Almanac for September 19, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 88°F 86°F 104°F 1919
        4. Low 49°F 54°F 33°F 1926
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.2 in -
        7. Snow 0 in 0 in -
        Almanac for September 20, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 89°F 86°F 107°F
        4. Low 49°F 53°F 35°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:55 AM 7:11 PM
        3. Civil Twilight 6:28 AM 7:37 PM
        4. Nautical Twilight 5:57 AM 8:08PM
        5. Astronomical Twilight 5:25 AM 8:40 PM
        1. Length of Visible Light 13h 9m
        2. Length of Day 12h 16m
        3. Tomorrow will be 2 minutes 29 seconds shorter
        1. Moon 3:30 PM -
        2. Waxing Gibbous60% of the Moon is Illuminated
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        Oct 10
        New Moon
        Oct 18
        Waxing Half First Qtr
        Precipitation
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