• Tonight

    Sep 20

    Lo 64°

    Mostly cloudy

    Home Energy Efficiency Weather
    • Avg
      RealFeel
      69°
    • Hi
      RealFeel
      75°
    • Wind
      Speed
      7 mph
    more
  • Sun

    Sep 21

    81°Lo 60°

    Clouds breaking for some sun

    Poor for home energy
    • Avg
      RealFeel
      71°
    • Hi
      RealFeel
      86°
    • Wind
      Speed
      3 mph
  • Mon

    Sep 22

    71°Lo 46°

    Mostly sunny and not as warm

    Poor for home energy
    • Avg
      RealFeel
      56°
    • Hi
      RealFeel
      69°
    • Wind
      Speed
      15 mph
    more
  • Tue

    Sep 23

    70°Lo 52°

    Sunny and nice

    Poor for home energy
    • Avg
      RealFeel
      59°
    • Hi
      RealFeel
      70°
    • Wind
      Speed
      6 mph
    more
  • Wed

    Sep 24

    72°Lo 52°

    Nice with plenty of sunshine

    Poor for home energy
    • Avg
      RealFeel
      61°
    • Hi
      RealFeel
      73°
    • Wind
      Speed
      6 mph
    more
Next Previous
Hi 81° RealFeel® 86° Precipitation 40%

Day

N

E

S

W

  • WSW 3 mph
  • Gusts: 8 mph

A morning shower in places; otherwise, warm and humid with clouds giving way to some sun

  • Max UV Index: 4 (Moderate)
  • Thunderstorms: 20%
  • 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
Lo 60° RealFeel® 56° Precipitation 55%

Night

N

E

S

W

  • NW 4 mph
  • Gusts: 9 mph

A shower or thunderstorm around in the 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

Temperature History - Sep 21

more Historical Weather Data >
  Today Normal Record 9/21/2013
High 81° 74° 96° (1895) 80°
Low 60° 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 20, 2014; 2:01 AM ET

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

Energy Efficient Lightbulbs and S.A.D

Sep 8, 2012; 5:00 AM ET With shorter days and colder nights in the fall and winter, some people develop seasonal affective disorder. When shopping for lightbulbs to treat the 'winter blues,'consider energy-efficient bulbs.

Sun. Home Energy Efficiency

Sun. Degree Days

Sun. UV Index