July weather forecastIslip, NY
July
Weather in July
July in Islip, New York, is a warm summer month, with an average temperature varying between 71.8°F (22.1°C) and 79°F (26.1°C).Temperature
July stands out as Islip's warmest month, with an average high-temperature of 79°F (26.1°C) and a low-temperature of 71.8°F (22.1°C).Humidity
The average relative humidity in July in Islip is 75%.Rainfall
The month with the most rainfall is July, when the rain falls for 17.9 days and typically aggregates up to 3.86" (98mm) of precipitation.Snowfall
April through September are months without snowfall in Islip.Ocean temperature
In Islip, New York, the average seawater temperature in July is 72.1°F (22.3°C).Note: When considering a person's aversion to cold, factors like sunshine, wind, and atmospheric temperature are key. Swimming in 72.1°F (22.3°C) might be delightful. (Remember: The Olympics' swimming events have water temperatures between 77°F (25°C) and 82.4°F (28°C).)
Daylight
The average length of the day in July in Islip is 14h and 45min.On the first day of July, sunrise is at 5:25 am and sunset at 8:28 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 8:09 pm EDT.
Sunshine
The month with the most sunshine is July, with an average of 10.8h of sunshine.UV index
The months with the highest UV index in Islip are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In July, the UV index of 6 transforms into the following advice:
Resist overexposure. Safeguarding from solar damage is indispensable. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Heads up! UV intensity is amplified by reflections from water and sand.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Islip, NY
- Average high temperature in July: 79°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in July: 71.8°F
The month with the highest average low temperature is August (72°F).
The coldest month (with the lowest average low temperature) is January (30°F).
Average pressure in July
Islip, NY
- Average pressure in July: 29.96"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
Islip, NY
- Average wind speed in July: 8.6mph
The windiest month (with the highest average wind speed) is January (13.4mph).
The calmest month (with the lowest average wind speed) is July (8.6mph).
Average humidity in July
Islip, NY
- Average humidity in July: 75%
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
Islip, NY
- Average rainfall in July: 3.86"
The wettest month (with the highest rainfall) is July (3.86").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in July
Islip, NY
- Average rainfall days in July: 17.9 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (7.6 days).
Average snowfall in July
Islip, NY
- Average snowfall in July: 0"
The month with the highest snowfall is March (1.97").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in July
Islip, NY
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is February (4.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in July
Islip, 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
Islip, NY
- Average daylight in July: 14h and 48min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in July: 10h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in July
Islip, NY
- Average sunshine days in July: 11.2 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.2 days).
Average UV index in July
Islip, 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 and December (UV index 2).
Average cloud cover in July
Islip, NY
- Average cloud cover in July: 28
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in July
Islip, 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).
