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    • Today

      Apr 21

      66° /39°F
      Sunshine and patchy clouds
      • 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: High
    • Sun

      Apr 22

      68° /42°
      Sunny and pleasant
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: High
      More
    • Mon

      Apr 23

      72° /40°
      Partly sunny and pleasant
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: High
      More
    • Tue

      Apr 24

      66° /39°
      Partly sunny and pleasant
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: High
      More
    • Wed

      Apr 25

      68° /44°
      Increasing cloudiness
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: High
      More

    Day

    66°Hi RealFeel® 72° Precipitation 0%
    Sunshine and patchy clouds
    • Winds from the
    • E 5 mph
    • Gusts: 9 mph
    • Max UV Index: 10 (Extreme)
    • Thunderstorms: 0%
    • Precipitation: 0 in
    • Rain: 0 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 0 hrs
    • Hours of Rain: 0 hrs

    Night

    39°Lo RealFeel® 38° Precipitation 0%
    Clear to partly cloudy
    • Winds from the
    • N 5 mph
    • Gusts: 7 mph
    • Max UV Index: N/A
    • Thunderstorms: 0%
    • Precipitation: 0 in
    • Rain: 0 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 0 hrs
    • Hours of Rain: 0 hrs

    Boulder Pollen Levels Apr 21

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

      High

    • Ragweed Pollen

      Low

    • Mold

      Low

    • Grass Pollen

      Low

    Temperature History

    more Historical Weather Data >
      Today Normal Record 4/21/2017
    High 66° 58° N/A 55°
    Low 39° 24° N/A 27°

    Sunrise/Sunset

    • Sunrise: 6:42 AM
    • Sunset: 8:07 PM
    • Duration: 13:25 hr

    Moonrise/Moonset

    • Moonrise: 11:29 AM
    • Moonset: 2:14 AM
    • Duration: 14:45 hr
    Astronomy

    Sat. Pollen

    Sat. Dust & Dander

    Sat. Wind Maps