Temperatures in May
It's cool in May in Long Island with an average temperature of 14°C. Temperatures this month range from a low of 11°C to a high of 16°C. At night, you can expect temperatures between 5°C and 8°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Long Island in May. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of May
The month of May starts in Long Island with cool temperatures, averaging around 14°C during the day and nights close to 6°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-May
By mid-May, the average daytime temperature rises to around 15°C, with nights close to 7°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of May
By the end of May, the average daytime temperature in Long Island will be around 15°C, with nights close to 8°C. A shower might show up, but overall the weather will be dry and sunny.
Discover cheap trips to Long Island 
Precipitation in May
In May, there is an average of 113 mm of precipitation, spread over 12 days. The wind speed is around 4 Bft, mostly coming from the South.
The average precipitation chance is 39% per day this month. The weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in May for Long Island. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Long Island in May |
London | ||
|---|---|---|---|
 Average Temperature |
14°C | 18°C | |
 High Temp |
16°C | 21°C | |
| Low Temp |
11°C | 15°C | |
 Total Precipitation |
113 mm | 46 mm | |
| Rainy Days |
12 days | 8 days | |
April
UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is May a good time to visit Long Island?
After some sun? Then May isn’t the best time to be in Long Island. There’s too much chance of rain this month.
Temperature records for Long Island in May
With 30°C, Long Island hit the highest temperature in the last 10 years in May 2023. The lowest daytime temperature in this month was 7°C in 2022. The extreme night temperatures ranged from a low of -1°C to a high of 13°C.
Check out the climate of Long Island for all months and discover the best travel time
Plan your next holiday
Don’t miss the best holiday deals for Long Island and see what our partners have for you.
Daily Temperature in May in Long Island
This chart shows the average daily temperatures, both day and night, for each day in May in Long Island, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in May in Long Island
The chart below shows the average daily precipitation in May for Long Island, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for May, you can expect around 12 days of rain in Long Island.
Daily UV Index in May in Long Island
This chart shows the average daily UV index in May in Long Island, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in May in Long Island Over the Years
This chart shows the average temperature in May in Long Island, measured in degrees Celsius, over the past years.
Total Precipitation in May in Long Island Over the Years
This chart shows the average precipitation in May in Long Island, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in May for Long Island
Click on a specific day in May for detailed info on the typical weather on that day in Long Island. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in May in Long Island
Have you been to Long Island in May?
Share your weather experience in May in Long Island.
Average Weather in Long Island by Month
Click on a month below to see detailed weather info for Long Island. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Long Island for all months at once
