May weather forecast
South Yarmouth, MA

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Weather in May

The last month of the spring, May, is a cool month in South Yarmouth, Massachusetts, with an average temperature ranging between max 55°F (12.8°C) and min 51.3°F (10.7°C).

Temperature

A minor escalation in the average high-temperature is seen with the onset of May, moving from a frosty 47.1°F (8.4°C) in April to a fresh 55°F (12.8°C). The nighttime temperature in South Yarmouth demonstrates a marginal decline, averaging at a still cool 51.3°F (10.7°C) during May.

Humidity

In May, the average relative humidity in South Yarmouth is 83%.

Rainfall

In May, in South Yarmouth, the rain falls for 12.5 days. Throughout May, 1.14" (29mm) of precipitation is accumulated. Throughout the year, in South Yarmouth, there are 129 rainfall days, and 14.21" (361mm) of precipitation is accumulated.

Snowfall

In South Yarmouth, snow does not fall in May through November.

Ocean temperature

In South Yarmouth, in May, the average water temperature is 49.1°F (9.5°C).
Note: Swimming in 49.1°F (9.5°C) poses a severe threat. Even short exposure to 55.4°F (13°C) is chilling, and going below 50°F (10°C) can cause breathing irregularities and intense cold shock, based on one's stamina.

Daylight

The average length of the day in May 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, in South Yarmouth, sunrise is at 5:08 am and sunset at 8:08 pm EDT.

Sunshine

In South Yarmouth, Massachusetts, the average sunshine in May is 8.6h.

UV index

In May, the average daily maximum UV index in South Yarmouth is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In May, the average maximum UV index of 4 translates into the following recommendations:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
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Frequently asked questions

What is the usual temperature for South Yarmouth in May?

The average high-temperature, in May, in South Yarmouth, is 55°F (12.8°C), while the average low-temperature is 51.3°F (10.7°C).

What is the average humidity in May in South Yarmouth?

The average relative humidity in May is 83%.

How many days does it rain in May in South Yarmouth?

In South Yarmouth, in May, it is raining for 12.5 days, with typically 1.14" (29mm) of accumulated precipitation.

When it does not snow in South Yarmouth?

May through November are months without snowfall in South Yarmouth, Massachusetts.

Does it snow in South Yarmouth in May?

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

What is the water temperature in May in South Yarmouth?

In South Yarmouth, the average seawater temperature in May is 49.1°F (9.5°C). Swimming in 49.1°F (9.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in May in South Yarmouth?

In May, the average day length in South Yarmouth, Massachusetts, is 14h and 33min.

When is the sunrise / sunset in May in South Yarmouth?

In May, on the first day of the month, sunrise is at 5:36 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 5:08 am and sunset at 8:08 pm EDT.

How many hours of sunshine does South Yarmouth have in May?

In May, the average sunshine duration is 8.6h.

What is the UV index intensity in May in South Yarmouth?

In South Yarmouth, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
South Yarmouth, MA

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).

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Average pressure in May
South Yarmouth, MA

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).

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Average wind speed in May
South Yarmouth, MA

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).

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Average humidity in May
South Yarmouth, MA

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%).

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Average rainfall in May
South Yarmouth, MA

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").

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Average rainfall days in May
South Yarmouth, MA

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).

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Average snowfall in May
South Yarmouth, MA

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").

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Average snowfall days in May
South Yarmouth, MA

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).

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Average sea temperature in May
South Yarmouth, MA

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).

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Average daylight in May /
Average sunshine in May
South Yarmouth, MA

Average daylight in May / Average sunshine in May - South Yarmouth, MA
  • Average daylight in May: 14h and 4min

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 4min

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).

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Average sunshine days in May
South Yarmouth, MA

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).

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Average UV index in May
South Yarmouth, MA

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).

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Average cloud cover in May
South Yarmouth, MA

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).

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Average visibility in May
South Yarmouth, MA

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).

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South Yarmouth, Massachusetts, USA

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