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    • Tonight

      Sep 25

      49° Lo
      Mainly clear and cool
      • Ragweed Pollen
        • Ragweed Pollen
        • Grass Pollen
        • Tree Pollen
        • Mold
        • Dust & Dander
        • Air Quality Index
      • Ragweed Pollen
      • Weather
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Mon

      Sep 26

      71° /64°F
      Mostly sunny and pleasant
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
    • Tue

      Sep 27

      73° /54°
      Morning rain; turning sunny
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Wed

      Sep 28

      75° /61°
      Partly sunny
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Thu

      Sep 29

      70° /63°
      Rain and drizzle possible
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    Monday
    9am
    10am
    11am
    12pm
    1pm
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    3pm
    4pm
    Forecast Mostly Sunny Sunny Sunny Sunny Mostly Sunny Mostly Sunny Partly Sunny Partly Sunny
    Temp (°F) 58° 62° 66° 68° 69° 70° 71° 70°
    RealFeel® 60° 65° 69° 72° 73° 73° 73° 70°
    Wind (mph) 5 E 6 ESE 6 ESE 7 SE 8 SSE 8 SSE 9 SSE 9 SSE
    precip
    9am
    10am
    11am
    12pm
    1pm
    2pm
    3pm
    4pm
    Rain
    2%
    2%
    2%
    2%
    2%
    2%
    2%
    3%
    Snow
    0%
    0%
    0%
    0%
    0%
    0%
    0%
    0%
    Ice
    0%
    0%
    0%
    0%
    0%
    0%
    0%
    0%
    SKY
    9am
    10am
    11am
    12pm
    1pm
    2pm
    3pm
    4pm
    UV Index 1 2 3 4 5 4 3 2
    Cloud Cover 10% 9% 2% 2% 10% 26% 41% 45%
    Humidity 57% 48% 42% 41% 38% 38% 38% 40%
    Dew Point 43° 42° 42° 43° 43° 43° 44° 45°
    Temp °F
    9am
    10am
    11am
    12pm
    1pm
    2pm
    3pm
    4pm
    75° 70° 65° 60° 55°

    Temperature History

    more Historical Weather Data >
      Today Normal Record 9/26/2015
    High 71° 73° 90° (2007) 70°
    Low 64° 58° 47° (1978) 59°

    Sunrise/Sunset

    • Sunrise: 6:48 AM
    • Sunset: 6:44 PM
    • Duration: 11:56 hr

    Moonrise/Moonset

    • Moonrise: 2:22 AM
    • Moonset: 4:32 PM
    • Duration: 14:10 hr
    Astronomy

    Mount Vernon Weather Report

    Crisp fall air to bring first frost of season to parts of northeastern US

    September 25, 2016; 9:29 PM ET

    Fall air has finally arrived in the northeastern United States and may yield the first frost of the season in parts of the region to end this weekend. More >

    Mon. Pollen

    Mon. Dust & Dander

    Mon. Wind Maps