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Port Jefferson
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Water Temperature in the Atlantic Ocean in Port Jefferson, New York: Current, Historical Data and Forecast
On this page, you will find comprehensive information about the sea temperature in Port Jefferson in New York, including current readings, historical data and trends, monthly averages, as well as weather forecasts and upcoming temperature predictions. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Current Water Temperature in Port Jefferson
41°F
TODAY
40°F
YESTERDAY
39°F
A WEEK AGO
Analysis, Historical Data, and Forecast of Water Temperature
Today sea water temperature in the Atlantic Ocean in Port Jefferson is 4.6°F. This water temperature is still quite low, and swimming in such conditions may only be comfortable for hardened individuals. It is recommended to limit the time spent in the water to avoid hypothermia. For those not accustomed to cold water, it is better to refrain from swimming. However, if you decide to enter the water, it is advisable to wear a warm wetsuit for protection against the cold.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart for Atlantic Ocean in Port Jefferson Over the Last 30 Days
The water temperature in Port Jefferson today is lower than both a week ago and a month ago. Today's sea temperature is generally in line with historical values for this day.
According to our forecast, the sea temperature in Port Jefferson will remain nearly unchanged in the coming days, its value will be 42°F.
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts across United States to enhance accuracy.
Water temperature data for Port Jefferson and nearby towns and resorts is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| Mar 21 | 39°F | 41°F | |
| Mar 22 | 40°F | 42°F | |
| Mar 23 | 39°F | 42°F | |
| Mar 24 | 40°F | 42°F | |
| Mar 25 | 41°F | 42°F | |
| Mar 26 | 41°F | 43°F | |
| Mar 27 | 40°F | 43°F | |
| Mar 28 | 41°F | 43°F | |
| Mar 29 | 43°F | 42°F | |
| Mar 31 | 44°F | 42°F | |
| Apr 1 | 42°F | 42°F | |
| Apr 2 | 42°F | 42°F | |
| Apr 3 | 42°F | 42°F | |
| Apr 4 | 43°F | 42°F | |
| Apr 5 | 43°F | 42°F | |
| Apr 6 | 43°F | 42°F |
Sea Temperature in Port Jefferson Throughout the Year
Throughout the year, the sea temperature in Port Jefferson exceeds 77°F (25°C) for 0 days, exceeds 72°F (22°C) for 56 days, and exceeds 64°F (18°C) for 120 days.
Below is the annual chart of sea temperature changes in the Atlantic Ocean in Port Jefferson.
January
| Minimum | Average | Maximum |
|---|---|---|
| 36°F | 43°F | 50°F |
February
| Minimum | Average | Maximum |
|---|---|---|
| 36°F | 40°F | 45°F |
March
| Minimum | Average | Maximum |
|---|---|---|
| 36°F | 40°F | 45°F |
April
| Minimum | Average | Maximum |
|---|---|---|
| 39°F | 46°F | 54°F |
May
| Minimum | Average | Maximum |
|---|---|---|
| 46°F | 55°F | 63°F |
June
| Minimum | Average | Maximum |
|---|---|---|
| 57°F | 65°F | 73°F |
July
| Minimum | Average | Maximum |
|---|---|---|
| 64°F | 72°F | 79°F |
August
| Minimum | Average | Maximum |
|---|---|---|
| 70°F | 74°F | 79°F |
September
| Minimum | Average | Maximum |
|---|---|---|
| 64°F | 71°F | 77°F |
October
| Minimum | Average | Maximum |
|---|---|---|
| 55°F | 64°F | 73°F |
November
| Minimum | Average | Maximum |
|---|---|---|
| 48°F | 56°F | 64°F |
December
| Minimum | Average | Maximum |
|---|---|---|
| 41°F | 48°F | 55°F |
Monthly Water Temperature Histogram for Atlantic Ocean in Port Jefferson
You can explore detailed data on how the water temperature in Port Jefferson varies each month:
What Beaches Are There In and Around Port Jefferson?
Harborfront Park
Harborfront Park is a 3-stars sandy beach, is located directly in Port Jefferson. There is parking. There are restrooms. There are cafés.
Port Jefferson Beach East
Port Jefferson Beach East is a 4-stars sandy beach, located in a 2 km (1 miles) radius of Port Jefferson. There are lifeguards on the beach. There is parking. There are restrooms. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
John W. Knapp Beach
John W. Knapp Beach is a 3-stars sandy beach, located in a 2 km (1 miles) radius of Port Jefferson. There is parking. There are restrooms. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Mcallister County Park
Mcallister County Park is a 3-stars sandy beach, located in a 3 km (2 miles) radius of Port Jefferson. There is parking. There are restrooms. Mcallister County Park is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish.
Cedar Beach West
Cedar Beach West is a 2-stars sandy beach, located in a 3 km (2 miles) radius of Port Jefferson. There is parking. Cedar Beach West is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish.
Brookhaven Town Beach
Brookhaven Town Beach is a 1-stars pebble beach, located in a 3 km (2 miles) radius of Port Jefferson. There is parking.
Bayview Beach
Bayview Beach is a 3-stars sandy beach, located in a 4 km (2 miles) radius of Port Jefferson. There are restrooms. Bayview Beach is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Bayberry Cove Beach
Bayberry Cove Beach is a 1-stars sandy beach, located in a 4 km (2 miles) radius of Port Jefferson.
Cedar Beach Mount Sinai
Cedar Beach Mount Sinai is a 4-stars sandy beach, located in a 4 km (2 miles) radius of Port Jefferson. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. Cedar Beach Mount Sinai is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish.
Miller Beach Surf Club
Miller Beach Surf Club is a 5-stars sandy beach, located in a 5 km (3 miles) radius of Port Jefferson. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Old Field Club
Old Field Club is a 3-stars sandy beach, located in a 6 km (4 miles) radius of Port Jefferson. There is parking. There are restrooms. There are cafés.
West Meadow Beach
West Meadow Beach is a 3-stars sandy beach, located in a 6 km (4 miles) radius of Port Jefferson. There are lifeguards on the beach. There is parking. There are restrooms.
Woodhull Landing
Woodhull Landing is a 2-stars sandy beach, located in a 7 km (4 miles) radius of Port Jefferson. There is parking. There are restrooms.
Stony Brook Beach
Stony Brook Beach is a 4-stars sandy beach, located in a 7 km (4 miles) radius of Port Jefferson. There are lifeguards on the beach. There are restrooms. Stony Brook Beach is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Flax Pond Beach
Flax Pond Beach is a 1-stars sandy beach, located in a 7 km (4 miles) radius of Port Jefferson.
Stony Brook Yacht Club
Stony Brook Yacht Club is a 3-stars sandy beach, located in a 8 km (5 miles) radius of Port Jefferson. There is parking. There are restrooms. There are cafés. Stony Brook Yacht Club is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish.
Scotts Beach Club
Scotts Beach Club is a 5-stars sandy beach, located in a 8 km (5 miles) radius of Port Jefferson. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. Snorkeling is possible. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Long Beach Town Park
Long Beach Town Park is a 5-stars sandy beach, located in a 9 km (6 miles) radius of Port Jefferson. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. Long Beach Town Park is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Suffolk Country Parkland
Suffolk Country Parkland is a 2-stars sandy beach, located in a 10 km (6 miles) radius of Port Jefferson. There are restrooms.
Schubert Beach
Schubert Beach is a 5-stars sandy beach, located in a 10 km (6 miles) radius of Port Jefferson. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Port Jefferson Weather
MARCH 30
46°F / 54°F
overcast clouds: 85-100%humidity: 94% | wind: 2 mph
MARCH 31
37°F / 54°F
light rainhumidity: 77% | wind: 3 mph
APRIL 1
34°F / 48°F
clear skyhumidity: 50% | wind: 2 mph
Sea Temperature in the Atlantic Ocean in Port Jefferson: General Trends and Swimming Opportunities
The coastal area in the region of New York, United States, experiences a humid subtropical climate with four distinct seasons. Winters can be very cold with moderate snowfall, and summers are typically hot and humid, while spring and autumn can display mild temperatures.
Port Jefferson is located in North America in the Northern Hemisphere at a latitude of 41 degrees, along the shores of the Atlantic Ocean. Port Jefferson lies within the New York in United States.
The average annual daytime air temperature in Port Jefferson is 61°F (16°C), with the average nighttime temperature being 45°F (7°C). The highest average daily temperature occurs in July, reaching 82°F (28°C), while the lowest is in January at 39°F (4°C). As for nighttime temperatures, the minimum average temperature of 24°F (-4°C) is recorded in January, and the maximum is in July, reaching 65°F (18°C).
According to historical data, Port Jefferson experiences 118 rainy days per year, which accounts for 32 percent of all days in the year. On average, there are 10 rainy days each month. The wettest month is December, with 11 rainy days and 4.4 inches (112 mm) of precipitation, while the driest month is October, which typically has 8 rainy days and only 3.8 inches (97 mm) of precipitation.
The average annual water temperature in Atlantic Ocean in Port Jefferson is 55°F (13°C). In January, the water reaches its lowest point of the year at 36°F (2°C), while in July, it peaks at 79°F (26°C). The month suitable for comfortable beach vacations and swimming in the Atlantic Ocean is August. During this month, the water temperature stays above 68°F (20°C) and can reach up to 79°F (26°C) on some days.
Geographical Location of Port Jefferson
Nearby Cities
Frequently Asked Questions About Port Jefferson and its Water Temperatures
What is the current sea temperature in Port Jefferson?
The water temperature today in the Atlantic Ocean in Port Jefferson is 41°F (5.2°C).
In which months is the water temperature in Port Jefferson comfortable for swimming?
The water temperature in the Atlantic Ocean in Port Jefferson is comfortable for swimming and beach vacations in August.
What is the water temperature in Port Jefferson during the winter?
The water temperature in the Atlantic Ocean in Port Jefferson during the winter ranges from 36°F to 55°F (2°C to 13°C).
What is the water temperature in Port Jefferson during the spring?
The water temperature in the Atlantic Ocean in Port Jefferson during the spring ranges from 36°F to 63°F (2°C to 17°C).
What is the water temperature in Port Jefferson during the summer?
The water temperature in the Atlantic Ocean in Port Jefferson during the summer ranges from 57°F to 79°F (14°C to 26°C).
What is the water temperature in Port Jefferson during the fall?
The water temperature in the Atlantic Ocean in Port Jefferson during the fall ranges from 48°F to 77°F (9°C to 25°C).
Is it possible to swim in the sea in Port Jefferson at any time of the year?
The Atlantic Ocean in Port Jefferson is quite cool, and swimming is only possible in June, July, August, September, and October when the water temperature reaches 70°F (21°C).
What sea temperatures can I expect in Port Jefferson in the next month?
In April, the water temperature in the Atlantic Ocean in Port Jefferson will range between 39°F (4°C) and 54°F (12°C)