May weather forecast and climate
Islip, NY

What is the temperature in May in Islip?

In Islip, in May, the average high-temperature is 67.5°F (19.7°C), and the average low-temperature is 49.8°F (9.9°C).

How many days does it rain in May in Islip?

In Islip, in May, it is raining for 11.1 days, with typically 3.8" (96mm) of accumulated precipitation.

Does it snow in Islip in May?

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

What is the water temperature in May in Islip?

The average seawater temperature, in May, in Islip, New York, is 53.4°F (11.9°C). Swimming in 53.4°F (11.9°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.
Average temperature in May - Islip, NY
  • Average high temperature in May: 67.5°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (38°F).

  • Average low temperature in May: 49.8°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (23.3°F).

Average rainfall in May - Islip, NY
  • Average rainfall in May: 3.8"

The wettest month (with the highest rainfall) is March (4.4").
The driest month (with the lowest rainfall) is February (3.3").

Average rainfall days in May - Islip, NY
  • Average rainfall days in May: 11.1 days

The month with the highest number of rainy days is April (11.3 days).
Months with the lowest number of rainy days are August and October (8.5 days).

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

The month with the highest snowfall is February (7.1").
Months with the lowest snowfall are May, June, July, August, September and October (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 January (3.7 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (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 - Islip, NY
  • Average daylight in May: 14.5h

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

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