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    • Today

      Sep 28

      59° /50°F
      Cooler; a little p.m. rain
      • Ragweed Pollen
        • Ragweed Pollen
        • Grass Pollen
        • Tree Pollen
        • Mold
        • Dust & Dander
        • Air Quality Index
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
    • Thu

      Sep 29

      62° /48°
      Mostly cloudy and windy
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Fri

      Sep 30

      59° /52°
      Cloudy with a shower or two
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Sat

      Oct 1

      59° /54°
      Periods of rain
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Sun

      Oct 2

      63° /54°
      Occasional rain and drizzle
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More

    Day

    59°Hi RealFeel® 55° Precipitation 50%
    Mostly cloudy and cooler; a little rain late this afternoon
    • NE 10 mph
    • Gusts: 21 mph
    • Max UV Index: 1 (Low)
    • Thunderstorms: 0%
    • Precipitation: 0.01 in
    • Rain: 0.01 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 0.5 hrs
    • Hours of Rain: 0.5 hrs

    Night

    50°Lo RealFeel® 44° Precipitation 65%
    Low clouds and spotty drizzle
    • NNE 9 mph
    • Gusts: 15 mph
    • Max UV Index: N/A
    • Thunderstorms: 0%
    • Precipitation: 0.04 in
    • Rain: 0.04 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 1.5 hrs
    • Hours of Rain: 1.5 hrs

    Chelmsford Pollen Levels Sep 28

    • Extreme
    • Very High
    • High
    • Moderate
    • Low
    • Tree Pollen

      Low

    • Ragweed Pollen

      Low

    • Mold

      Low

    • Grass Pollen

      Low

    Temperature History

    more Historical Weather Data >
      Today Normal Record 9/28/2015
    High 59° 68° N/A 81°
    Low 50° 46° N/A 44°

    Sunrise/Sunset

    • Sunrise: 6:40 AM
    • Sunset: 6:31 PM
    • Duration: 11:51 hr

    Moonrise/Moonset

    • Moonrise: 4:11 AM
    • Moonset: 5:33 PM
    • Duration: 13:22 hr
    Astronomy

    Chelmsford Weather Report

    Persistent rain to raise flood risk in part of northeastern US late this week

    September 28, 2016; 3:05 PM ET

    Rain will spread over much of the northeastern U.S. into the weekend, but persistent downpours will raise the flood risk in part of the mid-Atlantic. More >

    Wed. Pollen

    Wed. Dust & Dander

    Wed. Wind Maps