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 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 arrival of May brings a distinct temperature shift, with the average high-temperature escalating from an icy 40.8°F (4.9°C) in April to a refreshing 58.8°F (14.9°C). During May, the nighttime temperature averages of 39.6°F (4.2°C).Humidity
May is the least humid month, with an average relative humidity of 76%.Rainfall
In Grand Isle, during May, the rain falls for 16.6 days and regularly aggregates up to 2.76" (70mm) of precipitation. In Grand Isle, during the entire year, the rain falls for 140.8 days and collects up to 30.12" (765mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 1.2 snowfall days, in May, Grand Isle aggregates 0.87" (22mm) of snow. Throughout the year, there are 107.8 snowfall days, and 71.34" (1812mm) of snow is accumulated.Daylight
In Grand Isle, the average length of the day in May is 15h and 7min.On the first day of the month, sunrise is at 5:14 am and sunset at 7:44 pm. On the last day of May, sunrise is at 4:40 am and sunset at 8:20 pm EDT.
Sunshine
In May, the average sunshine is 7.6h.UV index
The average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 4 during May leads to these advisories:
Adopt protective measures - It is advised to guard against sun damage. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in May?
What is the least humid month in Grand Isle?
What is the average humidity in May?
How many days does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
When is the sunrise / sunset in May in Grand Isle?
How many hours of sunshine does Grand Isle have in May?
What is the UV index intensity in May?
Average temperature in May
Grand Isle, ME
- Average high temperature in May: 58.8°F
The warmest month (with the highest average high temperature) is July (74.3°F).
The month with the lowest average high temperature is January (18°F).
- Average low temperature in May: 39.6°F
The month with the highest average low temperature is July (53.6°F).
The coldest month (with the lowest average low temperature) is January (2.8°F).
Average pressure in May
Grand Isle, ME
- Average pressure in May: 29.96"Hg
The months with the highest atmospheric pressure are March, September and November (30.01"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Grand Isle, ME
- Average wind speed in May: 7.5mph
The windiest months (with the highest average wind speed) are January and February (8.2mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in May
Grand Isle, ME
- Average humidity in May: 76%
The month with the highest relative humidity is March (94%).
The month with the lowest relative humidity is May (76%).
Average rainfall in May
Grand Isle, ME
- Average rainfall in May: 2.76"
The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is February (1.97").
Average rainfall days in May
Grand Isle, ME
- Average rainfall days in May: 16.6 days
The month with the highest number of rainy days is July (17.1 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in May
Grand Isle, ME
- Average snowfall in May: 0.87"
The month with the highest snowfall is January (14.92").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Grand Isle, ME
- Average snowfall days in May: 1.2 days
The month with the highest number of snowfall days is January (21.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Grand Isle, ME
- Average daylight in May: 15h and 1min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in May: 7h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is February (Average sunshine: 2h and 6min).
Average sunshine days in May
Grand Isle, ME
- Average sunshine days in May: 12.1 days
The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is April (7.9 days).
Average UV index in May
Grand Isle, ME
- Average UV index in May: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in May
Grand Isle, ME
- Average cloud cover in May: 53
The month with the most cloud cover is February (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 42).
Average visibility in May
Grand Isle, ME
- Average visibility in May: 5mi
The months with the highest visibility are May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
Grand Isle, Maine, USA
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