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      Elev 510 ft, 39.142 °N 77.193 °W

      Gaithersburg, MD

      Gaithersburg Station66°
      Updated: 3:25 AM EDT on September 17, 2026 (GMT -4)
      4 minutes ago
      89°
      66°
      66
      Feels Like 66
      Mostly Cloudy
      N
      4
      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
        Today
        Thu 09/17
        High 89°f
         62% Precip. / 0.2 in
        Rain showers this morning with numerous thunderstorms developing during the afternoon hours. Storms may contain strong gusty winds. High 89F. Winds light and variable. Chance of rain 60%.
        Tonight
        Thu 09/17
        Low 70°f
         68% Precip. / 0.13 in
        Scattered thunderstorms during the evening. Partly cloudy skies after midnight. Low near 70F. Winds light and variable. Chance of rain 70%.
        Tomorrow
        Fri 09/18
        High 85°f62°f
         15% Precip. / 0 in
        Considerable clouds early. Some decrease in clouds later in the day. Slight chance of a rain shower. High around 85F. Winds N at 5 to 10 mph.
        Hourly Forecast
        Now
        69°
        4AM
        69°
        5AM
        69°
        6AM
        68°
        6:51AM
        Sunrise
        7AM
        67°
        8AM
        69°
        9AM
        73°
        10AM
        77°
        11AM
        82°
        12PM
        54%
        85°
        1PM
        84°
        2PM
        86°
        3PM
        88°
        4PM
        32%
        88°
        5PM
        62%
        86°
        6PM
        83°
        7PM
        47%
        82°
        7:13PM
        Sunset
        8PM
        69%
        78°
        9PM
        36%
        76°
        10PM
        31%
        75°
        11PM
        74°
        12AM
        73°
        1AM
        73°
        2AM
        73°
        3AM
        73°
        Precipitation
        69%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        35
        Good
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 30.24 in
        2. Visibility 10 miles
        3. Clouds Cloudy
        4. Dew Point68°F
        5. Humidity 96%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KGAI Station History
        Almanac for September 17, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 89°F 77°F 94°F 1991
        4. Low 66°F 60°F 35°F 1979
        5. Rain/Snow Depth
        6. Precipitation 0.34 in - in -
        7. Snow 0 in - in -
        Almanac for September 18, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 85°F 77°F 90°F
        4. Low 66°F 59°F 39°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:51 AM 7:13 PM
        3. Civil Twilight 6:25 AM 7:40 PM
        4. Nautical Twilight 5:53 AM 8:11PM
        5. Astronomical Twilight 5:21 AM 8:43 PM
        1. Length of Visible Light 13h 15m
        2. Length of Day 12h 21m
        3. Tomorrow will be 2 minutes 31 seconds shorter
        1. Moon 1:43 PM 10:39 PM
        2. Waxing Crescent39% 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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