Cities / United States / New York

20°

☁️ Port Jefferson weather

Overcast. .

Feels like 21° Wind 11 km/h NE Humidity 78% Pressure 1018 hPa UV 1 Air Fair ☀ 06:09 - 19:40

Right now it is 20° in Port Jefferson with overcast skies and today's high is 23° with an overnight low of 19°. The sun rises at 06:09 and sets at 19:40, giving 13h 31m of daylight. Over the coming week highs range from 25° to 29°.

Port Jefferson is in New York, United States, sitting 1 m above sea level, with a population of about 8,000. Local time is America/New_York (UTC−4), and every time on this page is shown in it.

Next 24 hours - temperature

19° 21° 23° 23° 20° 05:00 · 20° · 0 mm 06:00 · 19.6° · 0 mm 07:00 · 19.7° · 0 mm 08:00 · 20.7° · 0 mm 09:00 · 21.2° · 0 mm 10:00 · 21° · 0 mm 11:00 · 21.3° · 0 mm 12:00 · 21.7° · 0 mm 13:00 · 22.1° · 0 mm 14:00 · 22.7° · 0 mm 15:00 · 22.6° · 0 mm 16:00 · 22.6° · 0 mm 17:00 · 22.2° · 0 mm 18:00 · 22.2° · 0 mm 19:00 · 21.2° · 0 mm 20:00 · 20.9° · 0 mm 21:00 · 20.2° · 0 mm 22:00 · 19.7° · 0 mm 23:00 · 20° · 0 mm 00:00 · 20° · 0 mm 01:00 · 19.9° · 0 mm 02:00 · 20° · 0 mm 03:00 · 20.2° · 0 mm 04:00 · 20.2° · 0 mm

Precipitation

05:00 · 0 mm 05:00 06:00 · 0 mm 07:00 · 0 mm 08:00 · 0 mm 08:00 09:00 · 0 mm 10:00 · 0 mm 11:00 · 0 mm 11:00 12:00 · 0 mm 13:00 · 0 mm 14:00 · 0 mm 14:00 15:00 · 0 mm 16:00 · 0 mm 17:00 · 0 mm 17:00 18:00 · 0 mm 19:00 · 0 mm 20:00 · 0 mm 20:00 21:00 · 0 mm 22:00 · 0 mm 23:00 · 0 mm 23:00 00:00 · 0 mm 01:00 · 0 mm 02:00 · 0 mm 02:00 03:00 · 0 mm 04:00 · 0 mm

Hour by hour

TIMETEMPFEELSRAINCONDITIONS
05:00 ☁️ 20° 19.9° - Overcast
06:00 ☁️ 19.6° 19.1° - Overcast
07:00 ☁️ 19.7° 19.5° - Overcast
08:00 ☁️ 20.7° 21.2° - Overcast
09:00 ☁️ 21.2° 22.4° - Overcast
10:00 ☁️ 21° 21.9° - Overcast
11:00 ☁️ 21.3° 22.3° - Overcast
12:00 ☁️ 21.7° 23.9° - Overcast
13:00 ☁️ 22.1° 24.6° - Overcast
14:00 ☁️ 22.7° 25° - Overcast
15:00 ☁️ 22.6° 24.4° - Overcast
16:00 ⛅ 22.6° 24.4° - Partly cloudy

Next 16 days

Today☁️ 23°19° Sun 23🌧️ 25°20°32.4mm Mon 24☀️ 27°21° Tue 25☀️ 26°20° Wed 26☁️ 28°20° Thu 27🌦️ 29°21°3mm Fri 28🌧️ 29°21°13.8mm Sat 29☀️ 26°20° Sun 30☀️ 24°19° Mon 31⛅ 26°19° Tue 1🌧️ 30°22°12.3mm Wed 2☁️ 28°22° Thu 3☀️ 25°19° Fri 4☀️ 27°18° Sat 5☁️ 26°20° Sun 6☀️ 0°0°
☁️ TodayAugust 22nd Avg 21° Low 19° at 01:00 High 23° at 14:00 Feels 25° Wind ~12 km/h
Cloudy Cloudy Cloudy
00:00 19°
02:00 20°
04:00 20°
06:00 20°
08:00 21°
10:00 21°
12:00 22°
14:00 23°
16:00 23°
18:00 22°
20:00 21°
22:00 20°
🌧️ SundayAugust 23rd Avg 22° Low 20° at 01:00 High 25° at 15:00 32.4 mm rain Feels 28° Wind ~16 km/h
Cloudy
00:00 20°
02:00 20°
04:00 20°
06:00 20°
08:00 20°
10:00 22°
12:00 24°
14:00 25°
16:00 25°
18:00 23°
20:00 22°
22:00 21°
☀️ MondayAugust 24th Avg 24° Low 21° at 06:00 High 27° at 15:00 Feels 23° Wind ~26 km/h
Clear
00:00 21°
02:00 22°
04:00 22°
06:00 21°
08:00 22°
10:00 24°
12:00 26°
14:00 27°
16:00 27°
18:00 26°
20:00 24°
22:00 24°
☀️ TuesdayAugust 25th Avg 23° Low 20° at 07:00 High 26° at 14:00 Feels 22° Wind ~31 km/h
Clear Clear
00:00 23°
02:00 21°
04:00 21°
06:00 21°
08:00 21°
10:00 23°
12:00 25°
14:00 26°
16:00 25°
18:00 24°
20:00 23°
22:00 23°
☁️ WednesdayAugust 26th Avg 23° Low 20° at 06:00 High 28° at 17:00 Wind ~16 km/h
Cloudy Clear
00:00 21°
02:00 21°
04:00 20°
06:00 20°
08:00 21°
10:00 23°
12:00 24°
14:00 26°
16:00 28°
18:00 28°
20:00 24°
22:00 23°
🌦️ ThursdayAugust 27th Avg 24° Low 21° at 21:00 High 29° at 13:00 3 mm rain Wind ~19 km/h
Clear Cloudy Rain
00:00 22°
02:00 22°
04:00 22°
06:00 22°
08:00 24°
10:00 27°
12:00 29°
14:00 29°
16:00 28°
18:00 25° 0.9mm
20:00 21° 0.9mm
22:00 21° 0.1mm
🌧️ FridayAugust 28th Avg 24° Low 21° at 03:00 High 29° at 17:00 13.8 mm rain Wind ~17 km/h
Rain Partly Cloudy Cloudy
00:00 21° 1.4mm
02:00 21° 1.4mm
04:00 21° 0.7mm
06:00 21° 2.2mm
08:00 22° 2.2mm
10:00 24° 0.3mm
12:00 25°
14:00 26°
16:00 28°
18:00 28°
20:00 26°
22:00 24°
☀️ SaturdayAugust 29th Avg 23° Low 20° at 07:00 High 26° at 16:00 Feels 23° Wind ~17 km/h
Cloudy Clear Partly Cloudy Clear
00:00 22°
02:00 21°
04:00 21°
06:00 21°
08:00 21°
10:00 22°
12:00 24°
14:00 25°
16:00 26°
18:00 25°
20:00 23°
22:00 22°
☀️ SundayAugust 30th Avg 21° Low 19° at 07:00 High 24° at 17:00 Feels 22° Wind ~17 km/h
Cloudy Clear
00:00 21°
02:00 20°
04:00 20°
06:00 19°
08:00 19°
10:00 20°
12:00 21°
14:00 22°
16:00 23°
18:00 23°
20:00 21°
22:00 20°
⛅ MondayAugust 31st Avg 22° Low 19° at 04:00 High 26° at 14:00 Wind ~27 km/h
Clear Partly Cloudy Cloudy
00:00 20°
02:00 19°
04:00 19°
06:00 19°
08:00 21°
10:00 24°
12:00 26°
14:00 26°
16:00 26°
18:00 25°
20:00 23°
22:00 23°
🌧️ TuesdaySeptember 1st Avg 25° Low 22° at 23:00 High 30° at 15:00 12.3 mm rain Wind ~27 km/h
Cloudy Rain Cloudy Rain
00:00 23°
02:00 23°
04:00 23°
06:00 23° 1mm
08:00 23° 1mm
10:00 25° 0.6mm
12:00 28°
14:00 30°
16:00 30°
18:00 28° 0.7mm
20:00 25° 0.7mm
22:00 23° 1.8mm
☁️ WednesdaySeptember 2nd Avg 24° Low 22° at 00:00 High 28° at 15:00 Wind ~19 km/h
Cloudy Clear
00:00 22°
02:00 22°
04:00 22°
06:00 22°
08:00 23°
10:00 24°
12:00 26°
14:00 28°
16:00 28°
18:00 27°
20:00 25°
22:00 24°
☀️ ThursdaySeptember 3rd Avg 21° Low 19° at 07:00 High 25° at 16:00 Feels 23° Wind ~23 km/h
Clear
00:00 23°
02:00 21°
04:00 20°
06:00 19°
08:00 19°
10:00 20°
12:00 22°
14:00 24°
16:00 25°
18:00 24°
20:00 21°
22:00 20°
☀️ FridaySeptember 4th Avg 22° Low 18° at 04:00 High 27° at 17:00 Wind ~16 km/h
Clear Partly Cloudy
00:00 19°
02:00 19°
04:00 18°
06:00 19°
08:00 20°
10:00 22°
12:00 24°
14:00 25°
16:00 26°
18:00 25°
20:00 22°
22:00 22°
☁️ SaturdaySeptember 5th Avg 22° Low 20° at 23:00 High 26° at 16:00 Feels 24° Wind ~15 km/h
Cloudy Partly Cloudy Clear
00:00 21°
02:00 21°
04:00 21°
06:00 21°
08:00 21°
10:00 22°
12:00 23°
14:00 25°
16:00 26°
18:00 25°
20:00 22°
22:00 21°
☀️ SundaySeptember 6th Avg 21° Low 0° at 05:00 High 0° at 16:00 Feels 21° Wind ~23 km/h
Clear Unknown
00:00 20°
02:00 20°
04:00 19°
06:00 19°
08:00 20°
10:00 22°
12:00 23°
14:00 24°
16:00 24°
18:00 23°
20:00 20°
22:00 0°

Sun

☀️ Sunrise 06:09 · Sunset 19:40

13h 31m of daylight · America/New_York

Air quality

PM2.5 12.6 µg/m³ - Fair

Fine for almost everyone; unusually sensitive people may notice it on a long run.

Source: Copernicus CAMS, updated hourly.

Nearby

Poquott · 1.3 km Belle Terre · 1.5 km Crystal Brook · 2.3 km Port Jefferson Station · 3 km East Setauket · 3.1 km Setauket-East Setauket · 3.3 km

Tools for Port Jefferson

☔ Will it rain today? 🌅 Sunrise & sunset 🫁 Air quality 📼 Weather on this day

Common questions about Port Jefferson weather

Will it rain in Port Jefferson today?

No rain is in the forecast for Port Jefferson today.

What is the temperature in Port Jefferson right now?

It is 20° in Port Jefferson right now. Today runs between a low of 19° and a high of 23°.

What time is sunrise and sunset in Port Jefferson?

The sun rises at 06:09 and sets at 19:40 local time in Port Jefferson today, giving 13h 31m of daylight.

What is the air quality in Port Jefferson?

PM2.5 in Port Jefferson is currently 12.6 µg/m³, which counts as Fair on the European air-quality index. Fine for almost everyone; unusually sensitive people may notice it on a long run.

How accurate is the Port Jefferson forecast, and how far ahead does it go?

This page shows 16 days ahead, refreshed every hour. It blends ECMWF, NOAA GFS and whichever national high-resolution model covers Port Jefferson best. The first three days are the dependable part - day one is usually within a degree or two - and accuracy falls off steadily after day five, so read the far end as a trend rather than a plan. We publish our measured error against real station observations on the accuracy page.

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