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      Elev 600 ft, 33.151 °N 117.188 °W

      San Marcos, CA

      Pi Environmental Station81°
      Updated: 2:25 PM PDT on September 20, 2026 (GMT -7)
      5 minutes ago
      81°
      63°
      81
      Feels Like 83
      Sunny
      N
      7
      Same 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
        Mon 09/21
        High 81°f
         2% Precip. / 0 in
        A mix of clouds and sun. High 81F. Winds WSW at 5 to 10 mph.
        Tonight
        Mon 09/21
        Low 64°f
         14% Precip. / 0 in
        Cloudy. Low 64F. Winds light and variable.
        Tomorrow
        Tue 09/22
        High 74°f62°f
         15% Precip. / 0 in
        Cloudy skies early, then partly cloudy in the afternoon. High 74F. Winds SW at 5 to 10 mph.
        Hourly Forecast
        Now
        80°
        3PM
        79°
        4PM
        77°
        5PM
        75°
        6PM
        71°
        6:48PM
        Sunset
        7PM
        69°
        8PM
        68°
        9PM
        67°
        10PM
        66°
        11PM
        66°
        12AM
        65°
        1AM
        65°
        2AM
        66°
        3AM
        66°
        4AM
        66°
        5AM
        66°
        6AM
        66°
        6:36AM
        Sunrise
        7AM
        65°
        8AM
        66°
        9AM
        68°
        10AM
        69°
        11AM
        71°
        12PM
        72°
        1PM
        73°
        2PM
        73°
        Precipitation
        16%
        Pollen
        Ragweed Pollen
        Moderate
        Air Quality
        53
        Moderate
        UV Index
        6
        High
        Additional Conditions
        1. Pressure 29.9 in
        2. Visibility 10 miles
        3. Clouds Clear
        4. Dew Point60°F
        5. Humidity 51%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KCRQ Station History
        Almanac for September 20, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 81°F 80°F 98°F 2015
        4. Low 63°F 61°F 49°F 1965
        5. Rain/Snow Depth
        6. Precipitation 0 in - in -
        7. Snow 0 in - in -
        Almanac for September 21, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 74°F 80°F 95°F
        4. Low 63°F 61°F 50°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:35 AM 6:47 PM
        3. Civil Twilight 6:10 AM 7:12 PM
        4. Nautical Twilight 5:42 AM 7:41PM
        5. Astronomical Twilight 5:12 AM 8:10 PM
        1. Length of Visible Light 13h 1m
        2. Length of Day 12h 12m
        3. Tomorrow will be 2 minutes 2 seconds shorter
        1. Moon 3:32 PM 12:34 AM
        2. Waxing Gibbous69% 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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