July weather forecastPort Jefferson, NY
July
Weather in July
July is a warm summer month in Port Jefferson, New York, with temperature in the range of an average low of 71.1°F (21.7°C) and an average high of 79.2°F (26.2°C).Temperature
Port Jefferson's July weather, marked by an average high temperature of 79.2°F (26.2°C) and an average low temperature of 71.1°F (21.7°C), is the warmest in the year.Humidity
In Port Jefferson, the average relative humidity in July is 76%.Rainfall
In Port Jefferson, in July, during 16.5 rainfall days, 3.54" (90mm) of precipitation is typically accumulated. Throughout the year, there are 146.8 rainfall days, and 33.78" (858mm) of precipitation is accumulated.Snowfall
In Port Jefferson, New York, snow does not fall in April through September.Ocean temperature
In Port Jefferson, in July, the average water temperature is 72.1°F (22.3°C).Note: For those with a heightened sensitivity to cold, sunshine, wind, and outside temperature make a big difference in enjoying a swim at 72.1°F (22.3°C). (Olympic swimming regulations state a water temperature of 77°F (25°C) to 82.4°F (28°C).)
Daylight
The average length of the day in July is 14h and 46min.On the first day of the month, sunrise is at 5:24 am and sunset at 8:28 pm. On the last day of July, sunrise is at 5:48 am and sunset at 8:09 pm EDT.
Sunshine
With an average of 10.6h of sunshine, July has the most sunshine of the year.UV index
June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 6 during July translates into the following guidance:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Take caution! The UV rays from the Sun gain strength from sand and water reflections.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Port Jefferson, NY
- Average high temperature in July: 79.2°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 July: 71.1°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 July
Port Jefferson, NY
- Average pressure in July: 29.95"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 July
Port Jefferson, NY
- Average wind speed in July: 8.3mph
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 July
Port Jefferson, NY
- Average humidity in July: 76%
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 July
Port Jefferson, NY
- Average rainfall in July: 3.54"
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 July
Port Jefferson, NY
- Average rainfall days in July: 16.5 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 July
Port Jefferson, NY
- Average snowfall in July: 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 July
Port Jefferson, NY
- Average snowfall days in July: 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 July
Port Jefferson, NY
- Average sea temperature in July: 72.1°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 July /
Average sunshine in July
Port Jefferson, NY
- Average daylight in July: 14h and 48min
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 July: 10h and 36min
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 July
Port Jefferson, NY
- Average sunshine days in July: 13 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 July
Port Jefferson, NY
- Average UV index in July: 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 July
Port Jefferson, NY
- Average cloud cover in July: 30
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 July
Port Jefferson, NY
- Average visibility in July: 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).
