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      Elev 262 ft, 38.493 °N 122.468 °W

      St. Helena, CA

      St. Helena Station53°
      Updated: 12:10 AM PDT on September 5, 2026 (GMT -7)
      8 minutes ago
      63°
      57°
      53
      Feels Like 53
      Clear
      N
      1
      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 09/05
        Low 49°f
         2% Precip. / 0 in
        Clear skies. Low 49F. Winds light and variable.
        Tomorrow
        Sun 09/06
        High 80°f
         17% Precip. / 0 in
        A mainly sunny sky. High around 80F. Winds S at 5 to 10 mph.
        Tomorrow night
        Sun 09/06
        Low 48°f
         7% Precip. / 0 in
        A mostly clear sky. Low 48F. Winds WSW at 5 to 10 mph.
        Hourly Forecast
        Now
        55°
        1AM
        54°
        2AM
        53°
        3AM
        52°
        4AM
        51°
        5AM
        51°
        6AM
        50°
        6:43AM
        Sunrise
        7AM
        51°
        8AM
        56°
        9AM
        61°
        10AM
        66°
        11AM
        71°
        12PM
        73°
        1PM
        76°
        2PM
        78°
        3PM
        78°
        4PM
        78°
        5PM
        77°
        6PM
        75°
        7PM
        71°
        7:33PM
        Sunset
        8PM
        66°
        9PM
        63°
        10PM
        61°
        11PM
        59°
        12AM
        57°
        Precipitation
        18%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        26
        Good
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 29.95 in
        2. Visibility 9 miles
        3. Clouds Partly Cloudy
        4. Dew Point52°F
        5. Humidity 90%
        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 63°F 88°F 111°F 2022
        4. Low 57°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 77°F 88°F 113°F
        4. Low 57°F 55°F 43°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:42 AM 7:33 PM
        3. Civil Twilight 6:15 AM 8:00 PM
        4. Nautical Twilight 5:44 AM 8:32PM
        5. Astronomical Twilight 5:11 AM 9:04 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
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