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      Elev 1432 ft, 14.973 °N 91.896 °W

      San Marcos, GT

      Updated: 2:38 AM CST on September 16, 2026 (GMT -6)
      3 minutes ago
      80°
      62°
      64
      Feels Like 64
      Partly Cloudy
      N
      6
      Higher 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
        Wed 09/16
        Low 63°f
        2% Precip. / 0 in
        Partly cloudy skies. Low 63F. Winds light and variable.
        Tomorrow
        Thu 09/17
        High 82°f
        84% Precip. / 0.23 in
        Partly cloudy early with thunderstorms becoming likely during the afternoon. High 82F. Winds WSW at 5 to 10 mph. Chance of rain 80%.
        Tomorrow night
        Thu 09/17
        Low 63°f
        24% Precip. / 0 in
        A few clouds from time to time. Hazy. Low 63F. Winds light and variable.
        Hourly Forecast
        Now
        66°
        3AM
        66°
        4AM
        65°
        5AM
        65°
        5:56AM
        Sunrise
        6AM
        64°
        7AM
        65°
        8AM
        71°
        9AM
        76°
        10AM
        78°
        11AM
        80°
        12PM
        53%
        81°
        1PM
        65%
        81°
        2PM
        70%
        79°
        3PM
        84%
        79°
        4PM
        75%
        76°
        5PM
        53%
        76°
        6PM
        39%
        74°
        6:08PM
        Sunset
        7PM
        72°
        8PM
        70°
        9PM
        69°
        10PM
        68°
        11PM
        67°
        12AM
        67°
        1AM
        66°
        2AM
        65°
        Additional Conditions
        1. Pressure 29.93 in
        2. Visibility 10 miles
        3. Clouds Partly Cloudy
        4. Dew Point58°F
        5. Humidity 76%
        6. Rainfall 0.7 in
        7. Snow Depth 0 in
        MGSM Station History
        Almanac for
        1. Forecast Average Record
        2. Temperature
        3. High 80°F -°F -°F
        4. Low 62°F -°F -°F
        5. Rain/Snow Depth
        6. Precipitation 0 in - in -
        7. Snow 0 in - in -
        Almanac for
        1. Forecast Average Record
        2. Temperature
        3. High 81°F -°F -°F
        4. Low 62°F -°F -°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 5:56 AM 6:08 PM
        3. Civil Twilight 5:34 AM 6:29 PM
        4. Nautical Twilight 5:09 AM 6:54PM
        5. Astronomical Twilight 4:44 AM 7:19 PM
        1. Length of Visible Light 12h 54m
        2. Length of Day 12h 11m
        3. Tomorrow will be 50 seconds shorter
        1. Moon 10:40 AM 10:03 PM
        2. Waxing Crescent29% 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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        Weather Alerts
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