Live Weather & Forecast

Weather in Holtsville

New York, United States · Real-time conditions & 3-day outlook

Flag of United States
Overcast
12°C
Feels like 10°C
54°F / Feels 51°F
Overcast
Holtsville, New York
🌞 Daytime
Updated: 2026-04-18 11:00
💧
Humidity
83%
💨
Wind
17.3 km/h E
🌬️
Wind Gust
23.8 km/h
🌡️
Pressure
1019 mb
👁️
Visibility
16 km
☀️
UV Index
5.5 (Moderate)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
100%
💦
Dew Point
10.9°C
🌐
Wind Degree
90°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
203.9 μg/m³
NO₂
4.9 μg/m³
O₃
91 μg/m³
SO₂
1.6 μg/m³
PM 2.5
6 μg/m³
PM 10
7.2 μg/m³

Weather Alerts 5

Met · Minor · Expected
Coastal Flood Statement issued April 18 at 2:50AM EDT until April 19 at 12:00AM EDT by NWS Upton NY

* WHAT...Up to one half foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Southeast Suffolk County. * WHEN...This evening. * IMPACTS...Brief minor flooding of the more vulnerable locations near the waterfront and shoreline.

Do not drive through flooded roadways.

Met · Minor · Expected
Coastal Flood Statement issued April 18 at 2:50AM EDT until April 19 at 2:00AM EDT by NWS Upton NY

* WHAT...Up to one half foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Southwest Suffolk County. * WHEN...From this evening through late tonight. * IMPACTS...Brief minor flooding of the more vulnerable locations near the waterfront and shoreline.

Do not drive through flooded roadways.

Met · Minor · Expected
Coastal Flood Advisory issued April 18 at 2:50AM EDT until April 19 at 2:00AM EDT by NWS Upton NY

* WHAT...Up to one half foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Northwest Suffolk, Northern Queens and Northern Nassau Counties. * WHEN...From 11 PM this evening to 2 AM EDT Sunday. * IMPACTS...Minor flooding in the more vulnerable locations near the waterfront and shoreline. Some roads and low lying properties including pa...

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.

Met · Minor · Expected
Coastal Flood Advisory issued April 18 at 2:50AM EDT until April 19 at 12:00AM EDT by NWS Upton NY

* WHAT...Up to one foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Southern Queens and Southern Nassau Counties. * WHEN...From 8 PM this evening to midnight EDT tonight. * IMPACTS...Widespread flooding of vulnerable areas near the waterfront and shoreline, including roads, parking lots, parks, lawns, and homes and businesses with b...

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.

Met · Minor · Expected
Coastal Flood Advisory issued April 18 at 2:50AM EDT until April 19 at 2:00AM EDT by NWS Upton NY

* WHAT...Up to one foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...In Connecticut, Southern Fairfield County. In New York, Southern Westchester County. * WHEN...From 11 PM this evening to 2 AM EDT Sunday. * IMPACTS...Minor flooding in the more vulnerable locations near the waterfront and shoreline. Some roads and low lying properti...

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.

Today's Hourly Forecast

24-hour breakdown for Holtsville, New York

12 AM
Clear
13°
Clear
💧 90% 💨 18.7 km/h
1 AM
Clear
12°
Clear
💧 91% 💨 17.6 km/h
2 AM
Clear
12°
Clear
💧 87% 💨 11.9 km/h
3 AM
Clear
11°
Clear
💧 88% 💨 11.2 km/h
4 AM
Clear
10°
Clear
💧 91% 💨 11.5 km/h
5 AM
Mist
Mist
💧 94% 💨 11.5 km/h
6 AM
Clear
10°
Clear
💧 92% 💨 9 km/h
7 AM
Partly Cloudy
12°
Partly Cloudy
💧 89% 💨 12.2 km/h
8 AM
Sunny
13°
Sunny
💧 79% 💨 13.7 km/h
9 AM
Partly Cloudy
14°
Partly Cloudy
💧 77% 💨 14 km/h
10 AM
Overcast
15°
Overcast
💧 76% 💨 14 km/h
11 AM
Overcast
12°
Overcast
💧 83% 💨 17.3 km/h
12 PM
Cloudy
16°
Cloudy
💧 70% 💨 19.8 km/h
1 PM
Cloudy
17°
Cloudy
💧 67% 💨 19.8 km/h
2 PM
Partly Cloudy
17°
Partly Cloudy
💧 70% 💨 16.9 km/h
3 PM
Sunny
17°
Sunny
💧 68% 💨 18 km/h
4 PM
Sunny
16°
Sunny
💧 70% 💨 16.9 km/h
5 PM
Sunny
14°
Sunny
💧 75% 💨 18.4 km/h
6 PM
Partly Cloudy
12°
Partly Cloudy
💧 80% 💨 16.9 km/h
7 PM
Overcast
11°
Overcast
💧 88% 💨 15.8 km/h
8 PM
Overcast
10°
Overcast
💧 96% 💨 16.9 km/h
9 PM
Overcast
Overcast
💧 96% 💨 15.1 km/h
10 PM
Patchy rain nearby
Patchy rain nearby
💧 100% 💨 15.8 km/h 🌧️ 79%
11 PM
Fog
Fog
💧 100% 💨 14 km/h 🌧️ 77%

3-Day Forecast

Daily overview for Holtsville, New York

Today
Partly Cloudy
Partly Cloudy
17° /
🌧️ 0% chance of rain
💧 Avg. humidity: 84%
💨 Max wind: 19.8 km/h
🌧️ Total precip: 0.02 mm
☀️ UV Index: 6.9
🌅 Sunrise: 06:09 AM
🌇 Sunset: 07:36 PM
🌙 Waxing Crescent
🌑 Moon: 1% lit
Sun, Apr 19
Patchy rain nearby
Patchy rain nearby
12° /
🌧️ 89% chance of rain
💧 Avg. humidity: 82%
💨 Max wind: 24.8 km/h
🌧️ Total precip: 2.59 mm
☀️ UV Index: 2
🌅 Sunrise: 06:07 AM
🌇 Sunset: 07:37 PM
🌙 Waxing Crescent
🌑 Moon: 3% lit
Mon, Apr 20
Patchy rain nearby
Patchy rain nearby
10° /
🌧️ 87% chance of rain
💧 Avg. humidity: 46%
💨 Max wind: 27.7 km/h
🌧️ Total precip: 0.47 mm
☀️ UV Index: 5.2
🌅 Sunrise: 06:06 AM
🌇 Sunset: 07:38 PM
🌙 Waxing Crescent
🌑 Moon: 9% lit

Best Time to Visit Holtsville

Plan your trip to Holtsville, United States around the most favorable weather conditions.

Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
← Back to Holtsville 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Holtsville?
Current conditions in Holtsville: Overcast, temperature 12°C, humidity 83%.
What is the best time to visit Holtsville?
The best time to visit Holtsville is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Holtsville?
Holtsville is located at approximately 40.8° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Holtsville?
The wettest period in Holtsville is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Holtsville?
For visits to Holtsville during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Holtsville in?
Holtsville is located in United States, in the state of New York.
What are the public holidays in Holtsville in 2026?
View the 2026 public holidays for Holtsville on our Holidays page.
What are the GPS coordinates used for the weather forecast in Holtsville?
The weather forecast for Holtsville uses coordinates 40.8154, -73.0451.