May weather forecast
West Dennis, MA

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Weather in May

May, the last month of the spring in West Dennis, is a cool month, with an average temperature fluctuating between 51.3°F (10.7°C) and 55°F (12.8°C).

Temperature

West Dennis observes a slight ascent in average high-temperatures during May, adjusting from a chilly 47.1°F (8.4°C) in April to a fresh 55°F (12.8°C). West Dennis maintains an average of approximately a still cool 51.3°F (10.7°C) during May nights, with only a minimal decrease from the daytime temperature.

Humidity

In May, the average relative humidity is 83%.

Rainfall

In West Dennis, in May, during 12.5 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Throughout the year, there are 129 rainfall days, and 14.21" (361mm) of precipitation is accumulated.

Snowfall

In West Dennis, snow does not fall in May through November.

Ocean temperature

In West Dennis, the average seawater temperature in May is 49.1°F (9.5°C).
Note: Dipping into 49.1°F (9.5°C) below 50°F (10°C) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 55.4°F (13°C) feels cold to the bone.

Daylight

The average length of the day in May is 14h and 33min.
On the first day of May, 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.

Sunshine

The average sunshine in May is 8.6h.

UV index

In West Dennis, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: An average maximum UV index of 4 in May leads to these recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days.

Frequently asked questions

What are May temperatures?

During May, West Dennis experiences an average high-temperature of 55°F (12.8°C) and a low-temperature of 51.3°F (10.7°C).

What is the average humidity in May?

In May, the average relative humidity is 83%.

How much does it rain in May?

In May, in West Dennis, the rain falls for 12.5 days. Throughout May, 1.14" (29mm) of precipitation is accumulated.

When it does not snow?

In West Dennis, snow does not fall in May through November.

Does it snow in May?

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

How cold is the water in May?

In West Dennis, in May, the average water temperature is 49.1°F (9.5°C). Swimming in 49.1°F (9.5°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in May?

In West Dennis, the average day length in May is 14h and 33min.

What time are sunrise and sunset in May?

On the first day of May, 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 West Dennis have in May?

In West Dennis, the average sunshine duration in May is 8.6h.

What is the UV index intensity in May?

In West Dennis, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium health risk 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
West Dennis, MA

Average temperature in May - West Dennis, 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
West Dennis, MA

Average pressure in May - West Dennis, 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
West Dennis, MA

Average wind speed in May - West Dennis, 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
West Dennis, MA

Average humidity in May - West Dennis, 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
West Dennis, MA

Average rainfall in May - West Dennis, 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
West Dennis, MA

Average rainfall days in May - West Dennis, 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
West Dennis, MA

Average snowfall in May - West Dennis, 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
West Dennis, MA

Average snowfall days in May - West Dennis, 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
West Dennis, MA

Average sea temperature in May - West Dennis, 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
West Dennis, MA

Average daylight in May / Average sunshine in May - West Dennis, 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).

Average sunshine days in May
West Dennis, MA

Average sunshine days in May - West Dennis, 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
West Dennis, MA

Average UV index in May - West Dennis, 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
West Dennis, MA

Average cloud cover in May - West Dennis, 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
West Dennis, MA

Average visibility in May - West Dennis, 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).

West Dennis, Massachusetts, USA

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