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      Elev 633 ft, 39.821 °N 77.904 °W

      Mercersburg, PA

      Mercersburg Station78°
      Updated: 2:08 PM EDT on October 20, 2026 (GMT -4)
      1 minute ago
      71°
      37°
      78
      Feels Like 78
      Sunny
      N
      10
      Same temperature is expected today
      Wundermap

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       Wundermap
      50
      50
      575
      90
      50
      7
      0 mph
      50
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      50
      50
      50
      50
      Radar · Now
        Hyper-local data from Weather Underground's network of
        400,000+ personal weather stations worldwide
        Today
        Tue 10/20
        High 71°f
         1% Precip. / 0 in
        Plentiful sunshine. High 71F. Winds N at 10 to 15 mph.
        Tonight
        Tue 10/20
        Low 40°f
         5% Precip. / 0 in
        Clear skies. Low around 40F. Winds N at 5 to 10 mph.
        Tomorrow
        Wed 10/21
        High 67°f38°f
         5% Precip. / 0 in
        Sunny skies. High 67F. Winds N at 5 to 10 mph.
        Hourly Forecast
        Now
        70°
        3PM
        71°
        4PM
        71°
        5PM
        69°
        6PM
        64°
        6:24PM
        Sunset
        7PM
        61°
        8PM
        58°
        9PM
        56°
        10PM
        53°
        11PM
        51°
        12AM
        50°
        1AM
        49°
        2AM
        47°
        3AM
        46°
        4AM
        44°
        5AM
        43°
        6AM
        42°
        7AM
        41°
        7:28AM
        Sunrise
        8AM
        41°
        9AM
        46°
        10AM
        50°
        11AM
        55°
        12PM
        58°
        1PM
        61°
        2PM
        64°
        Precipitation
        6%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        17
        Good
        UV Index
        4
        Moderate
        Additional Conditions
        1. Pressure 30.25 in
        2. Visibility 10 miles
        3. Clouds Clear
        4. Dew Point40°F
        5. Humidity 34%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KHGR Station History
        Almanac for October 20, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 71°F 64°F 82°F 1963
        4. Low 37°F 37°F 18°F 1981
        5. Rain/Snow Depth
        6. Precipitation 0 in 0.11 in -
        7. Snow 0 in - in -
        Almanac for October 21, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 67°F 64°F 83°F
        4. Low 40°F 37°F 23°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 7:27 AM 6:24 PM
        3. Civil Twilight 6:59 AM 6:52 PM
        4. Nautical Twilight 6:28 AM 7:23PM
        5. Astronomical Twilight 5:57 AM 7:54 PM
        1. Length of Visible Light 11h 52m
        2. Length of Day 10h 57m
        3. Tomorrow will be 2 minutes 27 seconds shorter
        1. Moon 3:42 PM 1:21 AM
        2. Waxing Gibbous70% of the Moon is Illuminated
        Oct 26
        Full Moon
        Nov 1
        Waning Half Last Qtr
        Nov 9
        New Moon
        Nov 17
        Waxing Half First Qtr
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