May weather forecastSouth Yarmouth, MA
May
Weather in May
The last month of the spring, May, is a fresh month in South Yarmouth, Massachusetts, with an average temperature fluctuating between 51.3°F (10.7°C) and 55°F (12.8°C).Temperature
The arrival of May signals a slight increase in the average high-temperature, moving from a chilly 47.1°F (8.4°C) in April to a fresh 55°F (12.8°C). Night temperatures in May exhibit a subtle decrease, settling at an average of 51.3°F (10.7°C).Humidity
In May, the average relative humidity is 83%.Rainfall
In South Yarmouth, in May, during 12.5 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. In South Yarmouth, during the entire year, the rain falls for 129 days and collects up to 14.21" (361mm) of precipitation.Snowfall
In South Yarmouth, snow does not fall in May through November.Ocean temperature
In South Yarmouth, the average seawater temperature in May is 49.1°F (9.5°C).Note: It is life-risking to swim in 49.1°F (9.5°C). Briefly staying in 55.4°F (13°C) waters feels unsettling, and temperatures below 50°F (10°C) might result in cold shock and loss of breath control, hinging on personal endurance.
Daylight
In May, the average length of the day is 14h and 33min.On the first day of the month, sunrise is at 5:36 am and sunset at 7:39 pm. On the last day of May, sunrise is at 5:08 am and sunset at 8:08 pm EDT.
Sunshine
The average sunshine in May is 8.6h.UV index
The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum high UV index of 4 in May translates into the following recommendations:
Exercise prevention - Precautions against solar damage are endorsed. It's recommended to limit sun exposure when its radiation is at its peak during midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
South Yarmouth, MA
- Average high temperature in May: 55°F
The warmest month (with the highest average high temperature) is August (72.1°F).
The month with the lowest average high temperature is January (38.5°F).
- Average low temperature in May: 51.3°F
The month with the highest average low temperature is August (68.5°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in May
South Yarmouth, 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 Yarmouth, MA
- Average wind speed in May: 12.5mph
The windiest month (with the highest average wind speed) is January (16.8mph).
The calmest months (with the lowest average wind speed) are July and August (10.9mph).
Average humidity in May
South Yarmouth, MA
- Average humidity in May: 83%
The months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (74%).
Average rainfall in May
South Yarmouth, MA
- Average rainfall in May: 1.14"
The wettest month (with the highest rainfall) is October (1.93").
The driest month (with the least rainfall) is August (0.94").
Average rainfall days in May
South Yarmouth, MA
- Average rainfall days in May: 12.5 days
The month with the highest number of rainy days is May (12.5 days).
The month with the least rainy days is February (8.3 days).
Average snowfall in May
South Yarmouth, MA
- Average snowfall in May: 0"
The month with the highest snowfall is January (0.87").
The months with the least snowfall are May, June, July, August, September, October and November (0").
Average snowfall days in May
South Yarmouth, MA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in May
South Yarmouth, MA
- Average sea temperature in May: 49.2°F
The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).
Average daylight in May /
Average sunshine in May
South Yarmouth, 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 36min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The months with the least sunshine are February and December (Average sunshine: 4h and 36min).
Average sunshine days in May
South Yarmouth, MA
- Average sunshine days in May: 16.4 days
The month with the most sunshine days is September (18.6 days).
The month with the least sunshine days is February (14.3 days).
Average UV index in May
South Yarmouth, 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 Yarmouth, MA
- Average cloud cover in May: 43
The month with the most cloud cover is December (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in May
South Yarmouth, 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).
