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      Elev 79 ft, 38.402 °N 122.826 °W

      Sebastopol, CA

      Sebastopol Regional Library Station71°
      Updated: 11:43 AM PDT on September 17, 2026 (GMT -7)
      10 minutes ago
      75°
      50°
      71
      Feels Like 70
      Mostly Cloudy
      N
      4
      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
        Today
        Fri 09/18
        High 75°f
         1% Precip. / 0 in
        Mostly cloudy skies early, then partly cloudy this afternoon. High around 75F. Winds SSW at 10 to 15 mph.
        Tonight
        Fri 09/18
        Low 50°f
         20% Precip. / 0 in
        Clear to partly cloudy. Low around 50F. Winds SSE at 5 to 10 mph.
        Tomorrow
        Sat 09/19
        High 81°f50°f
         20% Precip. / 0 in
        Some clouds in the morning will give way to mainly sunny skies for the afternoon. Expect mist and reduced visibilities at times. High 81F. Winds S at 10 to 15 mph.
        Hourly Forecast
        Now
        71°
        12PM
        71°
        1PM
        73°
        2PM
        74°
        3PM
        73°
        4PM
        72°
        5PM
        71°
        6PM
        69°
        7PM
        65°
        7:15PM
        Sunset
        8PM
        62°
        9PM
        59°
        10PM
        57°
        11PM
        55°
        12AM
        55°
        1AM
        54°
        2AM
        52°
        3AM
        51°
        4AM
        51°
        5AM
        51°
        6AM
        52°
        6:55AM
        Sunrise
        7AM
        51°
        8AM
        52°
        9AM
        55°
        10AM
        60°
        11AM
        66°
        Precipitation
        21%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        49
        Good
        UV Index
        5
        Moderate
        Additional Conditions
        1. Pressure 30.11 in
        2. Visibility 10 miles
        3. Clouds Mostly Cloudy
        4. Dew Point54°F
        5. Humidity 56%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KSTS Station History
        Almanac for September 17, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 75°F 84°F 100°F 1939
        4. Low 50°F 48°F 37°F 1970
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.2 in -
        7. Snow 0 in 0 in -
        Almanac for September 18, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 81°F 84°F 102°F
        4. Low 50°F 48°F 35°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:54 AM 7:15 PM
        3. Civil Twilight 6:28 AM 7:42 PM
        4. Nautical Twilight 5:57 AM 8:13PM
        5. Astronomical Twilight 5:25 AM 8:45 PM
        1. Length of Visible Light 13h 14m
        2. Length of Day 12h 21m
        3. Tomorrow will be 2 minutes 27 seconds shorter
        1. Moon 1:50 PM 10:51 PM
        2. Waxing Crescent40% 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
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