May weather forecastSouth Wellfleet, MA
May
Weather in May
The last month of the spring, May, is a cool month in South Wellfleet, Massachusetts, with an average temperature varying between 54.3°F (12.4°C) and 49.8°F (9.9°C).Temperature
May brings a slight elevation in the average high-temperature, transitioning from April's frosty 46.8°F (8.2°C) to a fresh 54.3°F (12.4°C). During May, South Wellfleet's nights hold steady with an average temperature of 49.8°F (9.9°C), barely dropping from the daytime highs.Humidity
In May, the average relative humidity is 84%.Rainfall
In South Wellfleet, during May, the rain falls for 14.3 days and regularly aggregates up to 1.42" (36mm) of precipitation. In South Wellfleet, during the entire year, the rain falls for 136.1 days and collects up to 17.24" (438mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in May is 14h and 34min.On the first day of the month, sunrise is at 5:34 am and sunset at 7:39 pm. On the last day of May, sunrise is at 5:07 am and sunset at 8:08 pm EDT.
Sunshine
The average sunshine in May is 8.4h.UV index
In May, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 4 during May translates into the following recommendations:
Ensure safety - Recommendations to avert sunburn are presented. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
South Wellfleet, MA
- Average high temperature in May: 54.3°F
The warmest month (with the highest average high temperature) is August (71.1°F).
The month with the lowest average high temperature is January (38.7°F).
- Average low temperature in May: 49.8°F
The month with the highest average low temperature is August (67.6°F).
The coldest months (with the lowest average low temperature) are January and February (31.6°F).
Average pressure in May
South Wellfleet, MA
- Average pressure in May: 30.02"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
South Wellfleet, MA
- Average wind speed in May: 13.2mph
The windiest month (with the highest average wind speed) is January (18.5mph).
The calmest months (with the lowest average wind speed) are July and August (11.6mph).
Average humidity in May
South Wellfleet, MA
- Average humidity in May: 84%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is November (74%).
Average rainfall in May
South Wellfleet, MA
- Average rainfall in May: 1.42"
The wettest month (with the highest rainfall) is October (2.17").
The driest months (with the least rainfall) are February and November (1.18").
Average rainfall days in May
South Wellfleet, MA
- Average rainfall days in May: 14.3 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in May
South Wellfleet, MA
- Average snowfall in May: 0"
The month with the highest snowfall is February (0.94").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
South Wellfleet, MA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (6.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
South Wellfleet, MA
- Average daylight in May: 14h and 36min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in May
South Wellfleet, MA
- Average sunshine days in May: 15 days
The month with the most sunshine days is August (18.2 days).
The month with the least sunshine days is December (13.1 days).
Average UV index in May
South Wellfleet, MA
- Average UV index in May: 4
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in May
South Wellfleet, MA
- Average cloud cover in May: 45
The month with the most cloud cover is December (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in May
South Wellfleet, MA
- 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).
