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      Elev 63 ft, 42.834 °N 71.008 °W

      Merrimac, MA

      Merrimacport Station68°
      Updated: 1:30 PM EDT on September 22, 2026 (GMT -4)
      8 minutes ago
      64°
      47°
      68
      Feels Like 68
      Sunny
      N
      13
      Gusts 22 mph
      Lower 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
        Tue 09/22
        High 64°f
         1% Precip. / 0 in
        Sunshine and clouds mixed. High 64F. Winds ENE at 10 to 15 mph.
        Tonight
        Tue 09/22
        Low 46°f
         6% Precip. / 0 in
        A few clouds. Low 46F. Winds NNE at 5 to 10 mph.
        Tomorrow
        Wed 09/23
        High 63°f44°f
         5% Precip. / 0 in
        Abundant sunshine. High 63F. Winds NE at 10 to 20 mph.
        Hourly Forecast
        Now
        63°
        2PM
        63°
        3PM
        63°
        4PM
        62°
        5PM
        60°
        6PM
        58°
        6:41PM
        Sunset
        7PM
        55°
        8PM
        53°
        9PM
        51°
        10PM
        50°
        11PM
        49°
        12AM
        49°
        1AM
        48°
        2AM
        48°
        3AM
        48°
        4AM
        48°
        5AM
        47°
        6AM
        47°
        6:32AM
        Sunrise
        7AM
        47°
        8AM
        51°
        9AM
        54°
        10AM
        58°
        11AM
        60°
        12PM
        61°
        1PM
        61°
        Precipitation
        7%
        Pollen
        None
        Air Quality
        17
        Good
        UV Index
        5
        Moderate
        Additional Conditions
        1. Pressure 30.39 in
        2. Visibility 10 miles
        3. Clouds Partly Cloudy
        4. Dew Point42°F
        5. Humidity 47%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KLWM Station History
        Almanac for September 22, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 64°F 71°F 94°F 1965
        4. Low 47°F 49°F 22°F 1912
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.1 in -
        7. Snow 0 in 0 in -
        Almanac for September 23, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 62°F 71°F 94°F
        4. Low 47°F 48°F 30°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:31 AM 6:41 PM
        3. Civil Twilight 6:03 AM 7:09 PM
        4. Nautical Twilight 5:29 AM 7:42PM
        5. Astronomical Twilight 4:56 AM 8:16 PM
        1. Length of Visible Light 13h 6m
        2. Length of Day 12h 9m
        3. Tomorrow will be 2 minutes 54 seconds shorter
        1. Moon 4:55 PM 1:54 AM
        2. Waxing Gibbous84% 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
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