Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average sea temperature in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
The beginning of May signals a rise in the average high-temperature, moving from a fresh 52.9°F (11.6°C) in April to a refreshing 62.2°F (16.8°C). During May, the nighttime temperatures align closely with the daytime averages, measuring a fresh 54.5°F (12.5°C).Humidity
The months with the highest humidity are May and June, with an average relative humidity of 77%.Rainfall
In Islip, in May, it is raining for 15.8 days, with typically 2.95" (75mm) of accumulated precipitation. Throughout the year, in Islip, there are 153.2 rainfall days, and 34.45" (875mm) of precipitation is accumulated.Snowfall
April through September are months without snowfall.Ocean temperature
In Islip, in May, the average water temperature is 53.4°F (11.9°C).Note: Immersing oneself in 53.4°F (11.9°C) at sub14°F (-10°C) temperatures is a recipe for harsh cold shock and quickened breathing unless adequately equipped.
Daylight
The average length of the day in May in Islip is 14h and 28min.On the first day of May in Islip, sunrise is at 5:50 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:17 pm EDT.
Sunshine
The average sunshine in May in Islip, New York, is 9h.UV index
In Islip, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 5 in May translates into these instructions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Islip in May?
What are the most humid months in Islip?
What is the average humidity in May in Islip?
How much does it rain in Islip in May?
When it does not snow in Islip?
How cold is the water in May in Islip?
What is the average length of the day in May in Islip?
When are sunrise and sunset in May in Islip?
How many hours of sunshine does Islip have in May?
What is the UV index intensity in May in Islip?
Average temperature in May
Islip, NY
- Average high temperature in May: 62.2°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 May: 54.5°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 May
Islip, NY
- Average pressure in May: 30.01"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 May
Islip, NY
- Average wind speed in May: 9.8mph
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 May
Islip, NY
- Average humidity in May: 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 May
Islip, NY
- Average rainfall in May: 2.95"
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 May
Islip, NY
- Average rainfall days in May: 15.8 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 May
Islip, NY
- Average snowfall in May: 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 May
Islip, NY
- Average snowfall days in May: 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 May
Islip, NY
- Average sea temperature in May: 53.4°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 May /
Average sunshine in May
Islip, NY
- Average daylight in May: 14h and 3min
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 May: 9h and 0min
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 May
Islip, NY
- Average sunshine days in May: 13.9 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 May
Islip, NY
- Average UV index in May: 5
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 May
Islip, NY
- Average cloud cover in May: 41
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 May
Islip, NY
- Average visibility in May: 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).
Islip, New York, USA
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