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      Small Craft Advisory
      until 6:00 AM EDT
      Elev 440 ft, 39.456 °N 76.498 °W

      Glen Arm, MD

      Glen Arm Station63°
      Updated: 6:26 PM EDT on September 21, 2026 (GMT -4)
      8 minutes ago
      71°
      62°
      63
      Feels Like 63
      Cloudy
      N
      5
      Lower temperature is expected tomorrow
      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
        Mon 09/21
        Low 58°f
         84% Precip. / 0.27 in
        Rain showers early will evolve into a more steady rain overnight. Low 58F. Winds ENE at 5 to 10 mph. Chance of rain 80%. Rainfall near a quarter of an inch.
        Tomorrow
        Tue 09/22
        High 61°f
         89% Precip. / 0.45 in
        Periods of rain. High 61F. Winds NE at 10 to 15 mph. Chance of rain 90%. Rainfall around a half an inch.
        Tomorrow night
        Tue 09/22
        Low 53°f
         55% Precip. / 0.09 in
        Considerable cloudiness with occasional rain showers. Low 53F. Winds NE at 5 to 10 mph. Chance of rain 60%.
        Hourly Forecast
        Now
        63°
        7PM
        59%
        63°
        7:04PM
        Sunset
        8PM
        62°
        9PM
        62°
        10PM
        64°
        11PM
        64°
        12AM
        63°
        1AM
        42%
        63°
        2AM
        46%
        63°
        3AM
        55%
        63°
        4AM
        84%
        62°
        5AM
        81%
        61°
        6AM
        72%
        61°
        6:53AM
        Sunrise
        7AM
        68%
        60°
        8AM
        73%
        59°
        9AM
        88%
        59°
        10AM
        78%
        60°
        11AM
        79%
        59°
        12PM
        89%
        60°
        1PM
        87%
        60°
        2PM
        88%
        60°
        3PM
        84%
        60°
        4PM
        83%
        60°
        5PM
        75%
        60°
        6PM
        55%
        60°
        Precipitation
        89%
        Rain likely around 7:00 PM
        Pollen
        Ragweed Pollen
        Moderate
        Air Quality
        21
        Good
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 30.06 in
        2. Visibility 8 miles
        3. Clouds Cloudy
        4. Dew Point60°F
        5. Humidity 92%
        6. Rainfall 0.16 in
        7. Snow Depth 0 in
         KMTN Station History
        Almanac for September 21, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 71°F 78°F 93°F 1965
        4. Low 62°F 57°F 30°F 1956
        5. Rain/Snow Depth
        6. Precipitation 0.27 in 0.16 in -
        7. Snow 0 in - in -
        Almanac for September 22, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 64°F 77°F 95°F
        4. Low 62°F 57°F 36°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:52 AM 7:04 PM
        3. Civil Twilight 6:25 AM 7:31 PM
        4. Nautical Twilight 5:54 AM 8:02PM
        5. Astronomical Twilight 5:22 AM 8:34 PM
        1. Length of Visible Light 13h 5m
        2. Length of Day 12h 11m
        3. Tomorrow will be 2 minutes 34 seconds shorter
        1. Moon 4:40 PM 1:23 AM
        2. Waxing Gibbous77% 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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