June weather forecastPort Jefferson, NY

June

Weather in June

The first month of the summer, June, is a pleasant month in Port Jefferson, New York, with temperature in the range of an average low of 63.1°F (17.3°C) and an average high of 71.2°F (21.8°C).

Temperature

June introduces a minor temperature shift, with average high-temperatures adjusting from May's refreshing 62.6°F (17°C) to a pleasant 71.2°F (21.8°C). June introduces a small decrease to a nighttime average of 63.1°F (17.3°C).

Humidity

May and June, with an average relative humidity of 77%, are the most humid months.

Rainfall

In Port Jefferson, during June, the rain falls for 14.9 days and regularly aggregates up to 2.72" (69mm) of precipitation. Throughout the year, there are 146.8 rainfall days, and 33.78" (858mm) of precipitation is accumulated.

Snowfall

In Port Jefferson, snow does not fall in April through September.

Ocean temperature

In Port Jefferson, in June, the average water temperature is 64.6°F (18.1°C).
Note: The enjoyment of swimming decreases for most when the surface water temperature is 64.6°F (18.1°C). Breathing control becomes increasingly challenging as temperatures descend below 69.8°F (21°C).

Daylight

The month with the longest days is June, with an average of 15h and 6min of daylight.
On the first day of the month, sunrise is at 5:22 am and sunset at 8:18 pm. On the last day of June, sunrise is at 5:23 am and sunset at 8:28 pm EDT.

Sunshine

The average sunshine in June is 9.8h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index, 6 in June, converts into the following recommendations:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In June, in Port Jefferson, the average high-temperature is 71.2°F (21.8°C), and the average low-temperature is 63.1°F (17.3°C).

The months with the highest humidity are May and June, with an average relative humidity of 77%.

The average relative humidity in June is 77%.

In Port Jefferson, in June, it is raining for 14.9 days, with typically 2.72" (69mm) of accumulated precipitation.

In Port Jefferson, snow does not fall in April through September.

In Port Jefferson, the average seawater temperature in June is 64.6°F (18.1°C). For most, swimming in 64.6°F (18.1°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

June has the longest days of the year, with an average of 15h and 6min of daylight.

In Port Jefferson, the average day length in June is 15h and 4min.

On the first day of June, sunrise is at 5:22 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:28 pm EDT.

The average sunshine duration in June is 9.8h.

June through August, with an average maximum UV index of 6, are months with the highest UV index in Port Jefferson.

The average daily maximum UV index in June is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M June J A S O N D

May

June

Jul

Average high temperature

62.6°F

71.2°F

79.2°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

10.1mph

9.3mph

9mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

15.3

14.9

16.5

Average snowfall

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

14.5

13.1

Average UV index

Average cloud cover

Average visibility

Average temperature in June
Port Jefferson, NY

Average high temperature in June: 71.2°F

The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (37.6°F).

Average low temperature in June: 63.1°F

The months with the highest average low temperature are July and August (71.1°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).

Average pressure in June
Port Jefferson, NY

Average pressure in June: 29.93"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in June
Port Jefferson, NY

Average wind speed in June: 8.6mph

The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).

Average humidity in June
Port Jefferson, NY

Average humidity in June: 77%

The months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).

Average rainfall in June
Port Jefferson, NY

Average rainfall in June: 2.72"

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in June
Port Jefferson, NY

Average rainfall days in June: 14.9 days

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (6.8 days).

Average snowfall in June
Port Jefferson, NY

Average snowfall in June: 0"

The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, May, June, July, August and September (0").

Average snowfall days in June
Port Jefferson, NY

Average snowfall days in June: 0 days

The month with the highest number of snowfall days is February (4.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average sea temperature in June
Port Jefferson, NY

Average sea temperature in June: 64.6°F

The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

Average daylight in June /
Average sunshine in June
Port Jefferson, NY

Average daylight in June: 15h and 6min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

Average sunshine in June: 9h and 48min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in June
Port Jefferson, NY

Average sunshine days in June: 13.1 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (13 days).

Average UV index in June
Port Jefferson, NY

Average UV index in June: 6

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in June
Port Jefferson, NY

Average cloud cover in June: 35

The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility in June
Port Jefferson, NY

Average visibility in June: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).