May weather forecast and climate
West Islip, NY

May, the last month of the spring, in West Islip, is an enjoyable month, with temperature in the range of an average low of 54.7°F (12.6°C) and an average high of 62.2°F (16.8°C).

Temperature

In May, the average high-temperature rises, from a cool 52.9°F (11.6°C) in April, to a comfortable 62.2°F (16.8°C). In West Islip, in May, the average low-temperature is 54.7°F (12.6°C).

Humidity

May is the most humid month, with an average relative humidity of 78%.

Rainfall

In West Islip, during May, the rain falls for 16.2 days and regularly aggregates up to 3.11" (79mm) of precipitation. In West Islip, during the entire year, the rain falls for 157 days and collects up to 35.98" (914mm) of precipitation.

Snowfall

May through September are months without snowfall in West Islip.

Daylight

In May, the average length of the day is 14.5h.

Sunshine

The average sunshine in May is 9h.

UV index

In West Islip, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in May in West Islip?

In May, the average high-temperature is 62.2°F (16.8°C), and the average low-temperature is 54.7°F (12.6°C).

What is the most humid month in West Islip?

May is the most humid month in West Islip, New York, with an average relative humidity of 78%.

What is the average humidity in May in West Islip?

In West Islip, the average relative humidity in May is 78%.

How much does it rain in West Islip in May?

In West Islip, New York, during May, the rain falls for 16.2 days and regularly aggregates up to 3.11" (79mm) of precipitation.

Does it snow in West Islip in May?

In May, it doesn't snow. April is the latest month when it typically snows.

When it does not snow in West Islip?

May through September are months without snowfall in West Islip, New York.

What is the average length of the day in May in West Islip?

The average length of the day in May in West Islip is 14.5h.

How many hours of sunshine does West Islip have in May?

In May, the average sunshine in West Islip, New York, is 9h.

What is the UV index reading in May in West Islip?

In May, the average daily maximum UV index in West Islip is 5. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.
Average temperature in May - West 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: 54.7°F

Months with the highest average low temperature are July and August (72°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).

Average pressure in May - West Islip, NY
  • Average pressure in May: 30.01"

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

Average wind speed in May - West Islip, NY
  • Average wind speed in May: 10mph

The windiest month (with the highest average wind speed) is January (13.6mph).
The calmest month (with the lowest average wind speed) is July (8.9mph).

Average humidity in May - West Islip, NY
  • Average humidity in May: 78%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is November (71%).

Average rainfall in May - West Islip, NY
  • Average rainfall in May: 3.11"

The wettest month (with the highest rainfall) is July (3.98").
The driest month (with the least rainfall) is January (2.2").

Average rainfall days in May - West Islip, NY
  • Average rainfall days in May: 16.2 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.1 days).

Average snowfall in May - West Islip, NY
  • Average snowfall in May: 0"

The month with the highest snowfall is March (2.17").
Months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in May - West Islip, NY
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (4.2 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in May / Average sunshine in May - West Islip, NY
  • Average daylight in May: 14.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in May: 9h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.8h).

Average sunshine days in May - West Islip, NY
  • Average sunshine days in May: 13.5 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is July (11.4 days).

Average UV index in May - West Islip, NY
  • Average UV index in May: 5

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

Average cloud cover in May - West 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 - West Islip, NY
  • Average visibility in May: 6mi

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