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Current weather in Holtsville is broken clouds.

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Weather data for Holtsville is updated regularly with the latest available observations and forecasts.

Now · 2:52 AM

Holtsville Weather & Hourly Forecast

United States · New York · 11742

74°F

Mostly cloudy night

Feels like: 71°F

💧 Humidity 80% 🌡 Pressure 29.91 inHg 💨 Wind 17 mph 👁 Visibility 21.2 mi ☁ Clouds 71% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Holtsville

Today

3:00 AM

Mostly cloudy night

74° 💧 None 💨 17 mph H 80%29.91 inHg

6:00 AM

Overcast night

74° 💧 0.245 in 💨 13 mph H 74%29.88 inHg

9:00 AM

Light rain

71° 💧 0.025 in 💨 9 mph H 92%29.88 inHg

12:00 PM

Partly cloudy

81° 💧 None 💨 7 mph H 69%29.85 inHg

3:00 PM

Sunny

82° 💧 None 💨 7 mph H 62%29.83 inHg

6:00 PM

Mostly sunny

81° 💧 0.000 in 💨 6 mph H 66%29.83 inHg

9:00 PM

Mostly clear night

75° 💧 None 💨 5 mph H 84%29.85 inHg

Tomorrow

12:00 AM

Overcast night

75° 💧 None 💨 5 mph H 74%29.88 inHg

3:00 AM

Mostly cloudy night

71° 💧 None 💨 4 mph H 76%29.88 inHg

6:00 AM

Overcast night

70° 💧 None 💨 2 mph H 81%29.91 inHg

9:00 AM

Overcast

71° 💧 0.002 in 💨 5 mph H 67%29.97 inHg

12:00 PM

Overcast

70° 💧 None 💨 6 mph H 55%29.97 inHg

3:00 PM

Sunny

75° 💧 None 💨 5 mph H 41%29.94 inHg

6:00 PM

Sunny

74° 💧 None 💨 5 mph H 50%29.94 inHg

9:00 PM

Clear night

68° 💧 None 💨 2 mph H 68%30.00 inHg

Saturday

12:00 AM

Clear night

66° 💧 None 💨 2 mph H 73%30.03 inHg

Today

3:00 AM

Mostly cloudy night

74° 💧 None 💨 17 mph H 80%29.91 inHg

4:00 AM

Overcast night

74° 💧 None 💨 16 mph H 78%29.88 inHg

5:00 AM

Overcast night

75° 💧 None 💨 15 mph H 75%29.88 inHg

6:00 AM

Overcast night

74° 💧 0.001 in 💨 13 mph H 74%29.88 inHg

7:00 AM

Light rain

71° 💧 0.075 in 💨 12 mph H 87%29.88 inHg

8:00 AM

Moderate rain

70° 💧 0.169 in 💨 11 mph H 93%29.88 inHg

9:00 AM

Light rain

71° 💧 0.025 in 💨 9 mph H 92%29.88 inHg

10:00 AM

Mostly cloudy

74° 💧 None 💨 7 mph H 85%29.88 inHg

11:00 AM

Mostly cloudy

79° 💧 None 💨 7 mph H 75%29.88 inHg

12:00 PM

Partly cloudy

81° 💧 None 💨 7 mph H 69%29.85 inHg

1:00 PM

Mostly cloudy

82° 💧 None 💨 6 mph H 65%29.85 inHg

2:00 PM

Mostly cloudy

82° 💧 None 💨 7 mph H 62%29.83 inHg

3:00 PM

Sunny

82° 💧 None 💨 7 mph H 62%29.83 inHg

4:00 PM

Mostly sunny

83° 💧 None 💨 7 mph H 60%29.83 inHg

5:00 PM

Mostly sunny

83° 💧 None 💨 7 mph H 59%29.80 inHg

6:00 PM

Mostly sunny

81° 💧 0.000 in 💨 6 mph H 66%29.83 inHg

7:00 PM

Mostly sunny

77° 💧 None 💨 7 mph H 79%29.83 inHg

8:00 PM

Mostly clear night

75° 💧 None 💨 6 mph H 85%29.83 inHg

9:00 PM

Mostly clear night

75° 💧 None 💨 5 mph H 84%29.85 inHg

10:00 PM

Mostly cloudy night

75° 💧 None 💨 3 mph H 79%29.85 inHg

11:00 PM

Overcast night

75° 💧 None 💨 5 mph H 76%29.88 inHg

Tomorrow

12:00 AM

Overcast night

75° 💧 None 💨 5 mph H 74%29.88 inHg

1:00 AM

Partly cloudy night

74° 💧 None 💨 6 mph H 71%29.88 inHg

2:00 AM

Partly cloudy night

72° 💧 None 💨 5 mph H 72%29.88 inHg

3:00 AM

Mostly cloudy night

71° 💧 None 💨 4 mph H 76%29.88 inHg

4:00 AM

Overcast night

70° 💧 None 💨 4 mph H 79%29.88 inHg

5:00 AM

Overcast night

70° 💧 None 💨 3 mph H 81%29.88 inHg

6:00 AM

Overcast night

70° 💧 None 💨 2 mph H 81%29.91 inHg

7:00 AM

Overcast

70° 💧 None 💨 3 mph H 77%29.91 inHg

8:00 AM

Overcast

70° 💧 None 💨 4 mph H 73%29.94 inHg

9:00 AM

Overcast

71° 💧 None 💨 5 mph H 67%29.97 inHg

10:00 AM

Overcast

70° 💧 None 💨 6 mph H 61%29.97 inHg

11:00 AM

Overcast

69° 💧 0.002 in 💨 6 mph H 59%29.97 inHg

12:00 PM

Overcast

70° 💧 None 💨 6 mph H 55%29.97 inHg

1:00 PM

Overcast

73° 💧 None 💨 5 mph H 47%29.97 inHg

2:00 PM

Mostly cloudy

74° 💧 None 💨 5 mph H 42%29.94 inHg

3:00 PM

Sunny

75° 💧 None 💨 5 mph H 41%29.94 inHg

4:00 PM

Sunny

75° 💧 None 💨 6 mph H 44%29.94 inHg

5:00 PM

Sunny

74° 💧 None 💨 6 mph H 47%29.94 inHg

6:00 PM

Sunny

74° 💧 None 💨 5 mph H 50%29.94 inHg

7:00 PM

Sunny

71° 💧 None 💨 4 mph H 59%29.97 inHg

8:00 PM

Clear night

69° 💧 None 💨 3 mph H 64%29.97 inHg

9:00 PM

Clear night

68° 💧 None 💨 2 mph H 68%30.00 inHg

10:00 PM

Clear night

68° 💧 None 💨 1 mph H 69%30.03 inHg

11:00 PM

Clear night

67° 💧 None 💨 2 mph H 72%30.03 inHg

Saturday

12:00 AM

Clear night

66° 💧 None 💨 2 mph H 73%30.03 inHg

1:00 AM

Clear night

65° 💧 None 💨 3 mph H 73%30.06 inHg

2:00 AM

Clear night

64° 💧 None 💨 3 mph H 74%30.06 inHg

3:00 AM

Clear night

63° 💧 None 💨 3 mph H 77%30.06 inHg

4:00 AM

Clear night

62° 💧 None 💨 3 mph H 80%30.06 inHg

5:00 AM

Clear night

62° 💧 None 💨 3 mph H 82%30.09 inHg

6:00 AM

Clear night

61° 💧 None 💨 3 mph H 85%30.09 inHg

7:00 AM

Sunny

61° 💧 None 💨 3 mph H 87%30.12 inHg

8:00 AM

Sunny

65° 💧 None 💨 3 mph H 81%30.12 inHg

9:00 AM

Sunny

68° 💧 None 💨 4 mph H 71%30.12 inHg

10:00 AM

Sunny

70° 💧 None 💨 4 mph H 63%30.12 inHg

11:00 AM

Sunny

72° 💧 None 💨 6 mph H 62%30.12 inHg

12:00 PM

Mostly sunny

73° 💧 None 💨 6 mph H 62%30.12 inHg

1:00 PM

Mostly cloudy

73° 💧 None 💨 7 mph H 61%30.12 inHg

2:00 PM

Overcast

73° 💧 None 💨 8 mph H 63%30.12 inHg

3:00 PM

Overcast

73° 💧 None 💨 8 mph H 63%30.09 inHg

4:00 PM

Overcast

73° 💧 None 💨 8 mph H 63%30.09 inHg

5:00 PM

Overcast

72° 💧 None 💨 8 mph H 63%30.09 inHg

6:00 PM

Partly cloudy

72° 💧 None 💨 7 mph H 63%30.09 inHg

7:00 PM

Mostly cloudy

70° 💧 None 💨 6 mph H 68%30.09 inHg

8:00 PM

Overcast night

69° 💧 None 💨 6 mph H 69%30.09 inHg

11:00 PM

Partly cloudy night

72° 💧 None 💨 8 mph H 67%30.09 inHg

Sunday

2:00 AM

Partly cloudy night

71° 💧 None 💨 10 mph H 76%30.06 inHg

5:00 AM

Mostly cloudy night

72° 💧 None 💨 8 mph H 79%30.03 inHg

8:00 AM

Light rain

74° 💧 None 💨 13 mph H 87%30.00 inHg

11:00 AM

Moderate rain

73° 💧 None 💨 13 mph H 92%30.00 inHg

2:00 PM

Light rain

73° 💧 None 💨 11 mph H 90%29.94 inHg

5:00 PM

Overcast

75° 💧 None 💨 9 mph H 90%29.88 inHg

8:00 PM

Clear night

74° 💧 None 💨 7 mph H 93%29.88 inHg

11:00 PM

Clear night

74° 💧 None 💨 8 mph H 96%29.91 inHg

Monday

2:00 AM

Clear night

73° 💧 None 💨 8 mph H 92%29.88 inHg

5:00 AM

Partly cloudy night

70° 💧 None 💨 11 mph H 71%29.94 inHg

8:00 AM

Partly cloudy

69° 💧 None 💨 11 mph H 67%30.00 inHg

11:00 AM

Sunny

72° 💧 None 💨 13 mph H 58%30.03 inHg

2:00 PM

Sunny

74° 💧 None 💨 13 mph H 52%30.03 inHg

5:00 PM

Sunny

74° 💧 None 💨 13 mph H 48%30.06 inHg

8:00 PM

Clear night

70° 💧 None 💨 11 mph H 51%30.12 inHg

11:00 PM

Clear night

67° 💧 None 💨 7 mph H 59%30.18 inHg

Tuesday

2:00 AM

Clear night

64° 💧 None 💨 10 mph H 65%30.21 inHg

5:00 AM

Clear night

62° 💧 None 💨 8 mph H 72%30.24 inHg

8:00 AM

Sunny

62° 💧 None 💨 9 mph H 71%30.30 inHg

11:00 AM

Sunny

66° 💧 None 💨 4 mph H 63%30.33 inHg

2:00 PM

Mostly sunny

66° 💧 None 💨 8 mph H 69%30.30 inHg

8:00 PM

Mostly clear night

76° 💧 None 💨 10 mph H 89%30.15 inHg

Wednesday

2:00 AM

Mostly clear night

76° 💧 None 💨 13 mph H 89%30.15 inHg

8:00 AM

Mostly sunny

76° 💧 None 💨 13 mph H 90%30.15 inHg

2:00 PM

Mostly sunny

75° 💧 None 💨 11 mph H 92%30.15 inHg

8:00 PM

Clear night

76° 💧 None 💨 11 mph H 86%30.12 inHg

Thursday

2:00 AM

Clear night

76° 💧 None 💨 6 mph H 93%30.12 inHg

8:00 AM

Mostly cloudy

76° 💧 None 💨 7 mph H 94%30.15 inHg

2:00 PM

Moderate rain

74° 💧 None 💨 6 mph H 94%30.15 inHg

8:00 PM

Partly cloudy night

75° 💧 None 💨 7 mph H 93%30.12 inHg

Friday

2:00 AM

Mostly cloudy night

76° 💧 None 💨 10 mph H 93%30.00 inHg

8:00 AM

Mostly cloudy

76° 💧 None 💨 16 mph H 93%29.88 inHg

2:00 PM

Mostly sunny

77° 💧 None 💨 15 mph H 92%29.77 inHg

8:00 PM

Light rain

70° 💧 None 💨 15 mph H 78%29.83 inHg

Saturday

2:00 AM

Partly cloudy night

69° 💧 None 💨 10 mph H 71%29.88 inHg

8:00 AM

Mostly cloudy

66° 💧 None 💨 9 mph H 77%29.94 inHg

2:00 PM

Overcast

64° 💧 None 💨 8 mph H 79%29.97 inHg

8:00 PM

Overcast night

68° 💧 None 💨 6 mph H 72%29.94 inHg

Sunday

2:00 AM

Overcast night

68° 💧 None 💨 4 mph H 69%29.91 inHg

8:00 AM

Mostly cloudy

66° 💧 None 💨 3 mph H 77%29.91 inHg

2:00 PM

Overcast

66° 💧 None 💨 4 mph H 82%29.94 inHg

8:00 PM

Overcast night

72° 💧 None 💨 8 mph H 52%29.94 inHg

Monday

2:00 AM

Overcast night

69° 💧 None 💨 9 mph H 69%29.97 inHg

8:00 AM

Overcast

64° 💧 None 💨 15 mph H 67%30.03 inHg

2:00 PM

Mostly cloudy

59° 💧 None 💨 15 mph H 68%30.09 inHg

8:00 PM

Overcast night

66° 💧 None 💨 14 mph H 47%30.12 inHg

Tuesday

2:00 AM

Overcast night

65° 💧 None 💨 12 mph H 44%30.18 inHg

8:00 AM

Mostly sunny

57° 💧 None 💨 16 mph H 65%30.30 inHg

2:00 PM

Partly cloudy

55° 💧 None 💨 16 mph H 69%30.36 inHg

8:00 PM

Mostly cloudy night

63° 💧 None 💨 13 mph H 48%30.39 inHg

Wednesday

2:00 AM

Mostly clear night

62° 💧 None 💨 11 mph H 51%30.42 inHg

8:00 AM

Partly cloudy

59° 💧 None 💨 14 mph H 61%30.42 inHg

2:00 PM

Overcast

58° 💧 None 💨 15 mph H 70%30.45 inHg

8:00 PM

Overcast night

63° 💧 None 💨 15 mph H 58%30.45 inHg

Thursday

2:00 AM

Overcast night

62° 💧 None 💨 14 mph H 58%30.39 inHg

8:00 AM

Overcast

58° 💧 None 💨 13 mph H 73%30.33 inHg

2:00 PM

Overcast

59° 💧 None 💨 12 mph H 72%30.30 inHg

In Holtsville and, more broadly, across the state of New York: The evening will be mostly cloudy, with temperatures remaining mild around 68 to 69 degrees Fahrenheit. There is a high likelihood of rain, with some areas possibly receiving about 0.04 inches of precipitation. Winds will be coming from the south at up to 10 mph, with gusts reaching 32 mph. Expect the rain to continue into the night, so plan accordingly. Conditions may feel breezy at times due to gusty winds, especially during heavier rain showers. Temperatures will stay steady through the next few hours, but be prepared for the possibility of brief periods of heavier rain and wind. It’s advisable to keep an umbrella handy if you plan to be outdoors tonight.

15-Day Weather Outlook for Holtsville

TomorrowTomorrow

Partly cloudy 77°/70° 💧 None 💨 8 mph

Saturday, Sep 12Sat Sep 12

Partly cloudy 72°/62° 💧 0.040 in 💨 10 mph

Sunday, Sep 13Sun Sep 13

Moderate rain 75°/71° 💧 0.160 in 💨 13 mph

Monday, Sep 14Mon Sep 14

Partly cloudy 74°/69° 💧 0.002 in 💨 13 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 70°/62° 💧 None 💨 11 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 76°/75° 💧 0.002 in 💨 13 mph

Thursday, Sep 17Thu Sep 17

Moderate rain 76°/74° 💧 0.060 in 💨 11 mph

Friday, Sep 18Fri Sep 18

Partly cloudy 77°/75° 💧 0.061 in 💨 16 mph

Saturday, Sep 19Sat Sep 19

Light rain 70°/64° 💧 0.142 in 💨 15 mph

Sunday, Sep 20Sun Sep 20

Overcast 68°/66° 💧 0.005 in 💨 6 mph

Monday, Sep 21Mon Sep 21

Overcast 72°/59° 💧 0.002 in 💨 15 mph

Tuesday, Sep 22Tue Sep 22

Overcast 66°/55° 💧 None 💨 16 mph

Wednesday, Sep 23Wed Sep 23

Mostly cloudy 63°/58° 💧 None 💨 15 mph

Thursday, Sep 24Thu Sep 24

Overcast 63°/58° 💧 None 💨 15 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Holtsville

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Holtsville

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 3:00 AM

PM2.5 Fine particles Good 4,1µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 12,0µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Fair 98,4µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 0,9µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Holtsville

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 7,1High 🙂Fair

Tomorrow UV 5,3Moderate 😷Poor

Saturday UV 6,5High 😐Moderate

Sunday UV 5,9Moderate 😐Moderate

Monday UV 6,0High —Unavailable

Tuesday UV 6,0High —Unavailable

Wednesday UV 7,0High —Unavailable

Hourly UV index today

7:00 AMUV 0,0 8:00 AMUV 0,3 9:00 AMUV 0,5 10:00 AMUV 0,9 11:00 AMUV 1,6 12:00 PMUV 2,3 1:00 PMUV 7,1 2:00 PMUV 6,3 3:00 PMUV 4,8 4:00 PMUV 2,9 5:00 PMUV 1,3 6:00 PMUV 0,4

Today's weather health advice Open today's recommendations.

Strong UV exposure

Protect exposed skin with SPF 30+ sunscreen, wear sunglasses, and try to limit direct midday sun.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for Holtsville

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · HOLTSVILLE, NEW YORK

Tonight's Stargazing & Shooting Stars

Local night-sky conditions and meteor activity for Jasper.

49/100Best-hour score

No good viewing window tonight Astronomical darkness exists, but current sky conditions are unfavorable.

☁ Cloud cover 71% Real hourly forecast for the best viewing hour.

☾ Moonlight 3% New Moon · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 70° high at the best hour.

✦ Estimated visible meteors Poor visibility Meteor activity may occur above the clouds, but local viewing conditions are not suitable.

Chance ≥1 meteor in 30 minNot meaningful

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

DISCOVER WEATHER NEARBY Weather in other cities

Explore current conditions and forecasts for other locations.

Forecast data for Holtsville were last refreshed today at 2:52 AM. The current forecast period extends through 12/09/2026 at 12:00 AM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.