• Today

    Jul 29

    80°Lo 68°

    Heavy rain and a thunderstorm

    Good for biking
    • Precip
      70%
    • Hours of Precip
      5
    • Wind
      Gust
      17 mph
  • Sat

    Jul 30

    83°Lo 71°

    Humid with clouds and sun

    Very Good for biking
    • Precip
      25%
    • Hours of Precip
      1
    • Wind
      Gust
      8 mph
    more
  • Sun

    Jul 31

    78°Lo 71°

    Mostly cloudy with a t-storm

    Good for biking
    • Precip
      56%
    • Hours of Precip
      3.5
    • Wind
      Gust
      13 mph
    more
  • Mon

    Aug 1

    80°Lo 68°

    Mostly cloudy and humid

    Good for biking
    • Precip
      25%
    • Hours of Precip
      1.5
    • Wind
      Gust
      10 mph
    more
  • Tue

    Aug 2

    80°Lo 65°

    A thunderstorm in the area

    Very Good for biking
    • Precip
      40%
    • Hours of Precip
      1
    • Wind
      Gust
      12 mph
    more
Next Previous
Hi 80° RealFeel® 85° Precipitation 70%

Day

N

E

S

W

  • ENE 8 mph
  • Gusts: 17 mph

Heavy rain and a t-storm this morning; not as warm, some afternoon sun; watch for flash flooding

  • Max UV Index: 4 (Moderate)
  • Thunderstorms: 36%
  • Precipitation: 0.8 in
  • Rain: 0.8 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 5 hrs
  • Hours of Rain: 5 hrs
Lo 68° RealFeel® 70° Precipitation 13%

Night

N

E

S

W

  • SSE 4 mph
  • Gusts: 6 mph

Cloudy and humid

  • Max UV Index: N/A
  • Thunderstorms: 21%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

Temperature History - Jul 29

more Historical Weather Data >
  Today Normal Record 7/29/2015
High 80° 82° 96° (2002) 92°
Low 68° 66° 58° (1984) 71°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:46 AM with 14:24 of sunlight, then sets at 8:10 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 1:48 AM with 14:34 of moolight, then sets at 4:22 PM

Holtsville Weather Report

Soaking storms to elevate flash flood threat in northeastern US this weekend

July 29, 2016; 8:10 AM ET

Rounds of drenching showers and thunderstorms will heighten the risk of flash flooding across the northeastern United States through the final weekend of July. 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.