• Today

    Sep 21

    81°Lo 58°

    Clouds breaking and warm

    Low ragweed pollen levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      0 - Low
  • Mon

    Sep 22

    70°Lo 45°

    Mostly sunny and not as warm

    Low ragweed pollen levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      0 - Low
    more
  • Tue

    Sep 23

    71°Lo 50°

    Sunny and nice

    Low ragweed pollen levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      0 - Low
    more
  • Wed

    Sep 24

    72°Lo 54°

    Nice with plenty of sunshine

    Low ragweed pollen levels
    • Precip
      6%
    • Wind
      Speed
      6 mph
    • Cloud
      Cover
      1%
    more
  • Thu

    Sep 25

    73°Lo 52°

    Partly sunny and pleasant

    Ragweed Pollen Weather
    • Precip
      7%
    • Wind
      Speed
      4 mph
    • Cloud
      Cover
      26%
    more
Next Previous
Hi 81° RealFeel® 84° Precipitation 35%

Day

N

E

S

W

  • W 3 mph
  • Gusts: 7 mph

Warm with clouds giving way to some sun

  • Max UV Index: 4 (Moderate)
  • Thunderstorms: 20%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 58° RealFeel® 53° Precipitation 55%

Night

N

E

S

W

  • NW 4 mph
  • Gusts: 10 mph

A shower or thunderstorm around this evening; otherwise, partly cloudy

  • Max UV Index: N/A
  • Thunderstorms: 40%
  • Precipitation: 0.05 in
  • Rain: 0.05 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0.5 hrs
  • Hours of Rain: 0.5 hrs

Princeton Pollen Levels - September 21

  • Extreme
  • Very High
  • High
  • Moderate
  • Low
  • Grass

    Pollen

    Low

  • Weed

    Pollen

    Low

  • Tree

    Pollen

    Low

  • Mold

    Pollen

    Low

Temperature History - Sep 21

more Historical Weather Data >
  Today Normal Record 9/21/2013
High 81° 74° 96° (1895) 80°
Low 58° 54° 40° (1962) 51°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:45 AM with 12:13 of sunlight, then sets at 6:58 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:16 AM with 13:17 of moolight, then sets at 5:33 PM

Top Story

Princeton Weather Report

Philly: September Temperature Roller Coaster to Continue

September 21, 2014; 4:41 AM ET

In keeping with tradition, temperatures will continue their up-and-down cycle during the second half of September around Philadelphia. more >

Sun. Pollen

Sun. Dust & Dander

Sun. Wind Maps