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Weather in Holtsville, United States 🇺🇸

Weather Forecast in Holtsville

Current Weather in Holtsville

Small Craft Advisory issued July 19 at 2:22AM EDT until July 19 at 12:00PM EDT by NWS Upton NY
Partly cloudy
23°C
Feels like 25°C. Partly cloudy.
🌬️ 19 km/h NNW
💧 62% Humidity
🧭 1009 hPa
👁️ 16.0 km Visibility
☀️ UV Index: 7.6
🌡️ Dew Point: 19°C
🌅 Sunrise: 05:36 AM
🌇 Sunset: 08:20 PM
Map Overlays:

In Holtsville right now it is 23°C and partly cloudy, feeling like 25°C. Humidity is 62% with winds around 19 km/h, and the UV index is 8 (very high). Over the next few days, temperatures in Holtsville range from about 17°C to 28°C. ⚠️ Small Craft Advisory issued July 19 at 2:22AM EDT until July 19 at 12:00PM EDT by NWS Upton NY

Hourly Forecast for Holtsville

13:00
Sunny
26°
4%
14:00
Sunny
27°
3%
15:00
Sunny
25°
2%
16:00
Sunny
25°
2%
17:00
Sunny
28°
1%
18:00
Sunny
27°
2%
19:00
Sunny
26°
4%
20:00
Sunny
22°
5%
21:00
Clear
21°
6%
22:00
Clear
19°
6%
23:00
Clear
19°
7%
00:00
Clear
18°
9%
01:00
Clear
17°
9%
02:00
Clear
20°
4%
03:00
Clear
20°
4%
04:00
Clear
19°
4%
05:00
Clear
18°
4%
06:00
Sunny
18°
5%
07:00
Sunny
19°
4%
08:00
Sunny
20°
3%
09:00
Sunny
22°
2%
10:00
Sunny
23°
1%
11:00
Sunny
24°
1%
12:00
Sunny
24°
1%

14-Day Forecast for Holtsville

Sun, Jul 19
Sunny Sunny
28° / 19°
Mon, Jul 20
Sunny Sunny
24° / 17°
Tue, Jul 21
Sunny Sunny
26° / 21°
Wed, Jul 22
Sunny Sunny
26° / 20°
Thu, Jul 23
Sunny Sunny
24° / 17°
Fri, Jul 24
Sunny Sunny
24° / 18°
Sat, Jul 25
Sunny Sunny
26° / 20°
Sun, Jul 26
Sunny Sunny
26° / 18°
Mon, Jul 27
Sunny Sunny
26° / 20°
Tue, Jul 28
Sunny Sunny
24° / 20°
Wed, Jul 29
Partly Cloudy Partly Cloudy
26° / 22°
Thu, Jul 30
Patchy rain nearby Patchy rain nearby
27° / 22°
Fri, Jul 31
Sunny Sunny
27° / 23°
Sat, Aug 01
Sunny Sunny
28° / 23°

Additional Forecasts for Holtsville

Air Quality

💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 170.0 μg/m³
O₃ (Ozone) 111.0 μg/m³
NO₂ (Nitrogen Dioxide) 1.8 μg/m³
SO₂ (Sulphur Dioxide) 0.9 μg/m³
PM2.5 (Fine particles) 7.1 μg/m³
PM10 (Coarse particles) 7.2 μg/m³

Historical Weather

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Best Time to Be Outside in Holtsville Today

The most comfortable window in Holtsville today looks like 20:00 to 06:00, when it is around 20°C. It should stay dry through that window. No significant rain is expected in the next several hours.

Frequently Asked Questions about Weather in Holtsville

What is the temperature in Holtsville right now?

The current temperature in Holtsville is 23°C (74°F), partly cloudy (feels like 25°C).

What's the weather like in Holtsville right now?

Conditions in Holtsville right now: Partly cloudy, humidity 62%, wind 19 km/h NNW.

What is today's forecast for Holtsville?

Today in Holtsville: high 28°C, low 19°C, sunny. Chance of rain: 18%.

What is the 7-day weather forecast for Holtsville?

Daily highs and lows for Holtsville:

  • 2026-07-19: 28°C / 19°C
  • 2026-07-20: 24°C / 17°C
  • 2026-07-21: 26°C / 21°C
  • 2026-07-22: 26°C / 20°C
  • 2026-07-23: 24°C / 17°C
  • 2026-07-24: 24°C / 18°C
  • 2026-07-25: 26°C / 20°C
Is it going to rain in Holtsville today?

There is a 18% chance of rain in Holtsville today. Total expected precipitation: 0.23 mm.

What is the wind speed in Holtsville right now?

Wind in Holtsville is currently 19 km/h (12 mph) from the NNW.

What is the UV index in Holtsville right now?

The UV index in Holtsville is currently 7.6 (high). Sun protection is recommended when the index is 3 or higher.

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