• Today

    Sep 19

    64°Lo 54°

    Mostly sunny and cooler

    Excellent for biking
    • Precip
      5%
    • Hours of Precip
      0
    • Wind
      Gust
      34 mph
    more
  • Sat

    Sep 20

    74°Lo 64°

    Clouds giving way to some sun

    Excellent for biking
    • Precip
      25%
    • Hours of Precip
      0
    • Wind
      Gust
      22 mph
    more
  • Sun

    Sep 21

    78°Lo 59°

    Partly sunny

    Excellent for biking
    • Precip
      25%
    • Hours of Precip
      0
    • Wind
      Gust
      11 mph
  • Mon

    Sep 22

    70°Lo 49°

    Partly sunny and not as warm

    Excellent for biking
    • Precip
      12%
    • Hours of Precip
      0
    • Wind
      Gust
      20 mph
    more
  • Tue

    Sep 23

    71°Lo 53°

    Partly sunny and pleasant

    Excellent for biking
    • Precip
      8%
    • Hours of Precip
      0
    • Wind
      Gust
      12 mph
    more
Next Previous
Hi 78° RealFeel® 81° Precipitation 25%

Day

N

E

S

W

  • S 6 mph
  • Gusts: 11 mph

Partly sunny; warm in the afternoon

  • Max UV Index: 5 (Moderate)
  • Thunderstorms: 7%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 59° RealFeel® 54° Precipitation 55%

Night

N

E

S

W

  • W 8 mph
  • Gusts: 13 mph

A shower or thunderstorm 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 78° 72° 82° (1989) 76°
Low 59° 55° 43° (1991) 55°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:38 AM with 12:13 of sunlight, then sets at 6:51 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:09 AM with 13:17 of moolight, then sets at 5:26 PM

Top Story

Holtsville Weather Report

NYC: September Temperature Roller Coaster to Continue

September 19, 2014; 11:00 AM ET

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

Is Your Outdoor Gear Waterproof?

Dec 5, 2012; 5:00 AM ET Now that it's cold enough to hit the slopes, you may want to look more closely at what materials your winter sports gear is made of. As it turns out, not all waterproofing is created equal.