May weather forecast
Wellfleet, MA

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Weather in May

May presents a remarkable leap from the cool weather of April to the pleasant warmth typical of spring. The weather conditions are ideal for exploring the outdoors with low pressure and impressive visibility of 6 miles throughout the month. Marked by the highest relative humidity average of 84% throughout the year, May offers a moist environment, ideal for the proliferation of area’s flora. Nature enthusiasts and tourists are drawn to the city's beauty and blossoming plant life. As expected, June takes a leap towards the upcoming summer, promising increased daylight hours and warmer temperatures.

Temperature

Wellfleet's weather shows a minor temperature rise with the arrival of May, moving from a frosty 46.8°F (8.2°C) in April to a fresh 54.3°F (12.4°C). Wellfleet experiences a steady nighttime temperature of 49.8°F (9.9°C) throughout the month of May.

Humidity

In Wellfleet, the average relative humidity in May is 84%.

Rainfall

In Wellfleet, in May, during 14.3 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In 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 in Wellfleet, Massachusetts.

Ocean temperature

In Wellfleet, in May, the average water temperature is 49.1°F (9.5°C).
Note: With the appropriate swimsuit, one can swim in 49.1°F (9.5°C) even if temperatures dip below 50°F (10°C); otherwise, be ready for cold shock and breath issues. A fleeting swim around 55.4°F (13°C) is distressing.

Daylight

In May, the average length of the day is 14h and 35min.
On the first day of the month, sunrise is at 5:35 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

In Wellfleet, the average sunshine in May is 8.4h.

UV index

In Wellfleet, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: An average maximum UV index of 4 in May leads to these recommendations:
Ensure safety - Recommendations to avert sunburn are presented. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
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Frequently asked questions

What is the usual temperature for Wellfleet in May?

The high-temperature, in May, in Wellfleet, records 54.3°F (12.4°C), while the low-temperature is 49.8°F (9.9°C).

What is the average humidity in May in Wellfleet?

In May, the average relative humidity in Wellfleet is 84%.

How many days does it rain in May in Wellfleet?

In Wellfleet, during May, the rain falls for 14.3 days and regularly aggregates up to 1.42" (36mm) of precipitation.

When it does not snow in Wellfleet?

May through October are months without snowfall in Wellfleet, Massachusetts.

Does it snow in Wellfleet in May?

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

What is the ocean temperature in May in Wellfleet?

In Wellfleet, Massachusetts, the average seawater temperature in May is 49.1°F (9.5°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in May in Wellfleet?

In May, the average day length in Wellfleet, Massachusetts, is 14h and 35min.

When is the sunrise / sunset in May in Wellfleet?

On the first day of May in Wellfleet, sunrise is at 5:35 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 5:07 am and sunset at 8:08 pm EDT.

How many hours of sunshine does Wellfleet have in May?

The average sunshine duration in May is 8.4h.

How high is the UV index in May in Wellfleet?

The average daily maximum UV index in May in Wellfleet, Massachusetts, is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJFMAMayJJASOND
Apr
May
Jun
Average high temperature
46.8°F 8.2°C
54.3°F 12.4°C
62.4°F 16.9°C
Average low temperature
42.3°F 5.7°C
49.8°F 9.9°C
58.6°F 14.8°C
Average pressure
29.98" 761mmHg
30.02" 763mmHg
29.93" 760mmHg
Average wind speed
15.3mph 24.6km/h
13.2mph 21.2km/h
12.5mph 20.1km/h
Average max. wind speed
16.3mph 26.2km/h
14.1mph 22.7km/h
13.2mph 21.2km/h
Average wind speed gusts
26.5mph 42.6km/h
24.4mph 39.3km/h
23mph 37km/h
Average humidity
80%
84%
84%
Average rainfall
1.5" 38mm
1.42" 36mm
1.38" 35mm
Average rainfall days
12.8
14.3
12.6
Average snowfall
0.04" 1mm
0" 0mm
0" 0mm
Average snowfall days
0.8
0
0
Average sea temperature
43.5°F 6.4°C
49.2°F 9.6°C
57.7°F 14.3°C
Average daylight
13h 2min
14h 4min
15h 1min
Average sunshine
8h 2min
8h 2min
9h 2min
Average sunshine days
14.8
15
16.3
Average UV index
3
4
5
Average cloud cover
46%
45%
38%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in May
Wellfleet, MA

Average temperature in May - 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).

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Average pressure in May
Wellfleet, MA

Average pressure in May - 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).

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Average wind speed in May
Wellfleet, MA

Average wind speed in May - 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).

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Average humidity in May
Wellfleet, MA

Average humidity in May - 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%).

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Average rainfall in May
Wellfleet, MA

Average rainfall in May - 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").

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Average rainfall days in May
Wellfleet, MA

Average rainfall days in May - 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).

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Average snowfall in May
Wellfleet, MA

Average snowfall in May - 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").

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Average snowfall days in May
Wellfleet, MA

Average snowfall days in May - 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).

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Average sea temperature in May
Wellfleet, MA

Average sea temperature in May - Wellfleet, 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
Wellfleet, MA

Average daylight in May / Average sunshine in May - Wellfleet, 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 2min

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).

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Average sunshine days in May
Wellfleet, MA

Average sunshine days in May - 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).

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Average UV index in May
Wellfleet, MA

Average UV index in May - 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).

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Average cloud cover in May
Wellfleet, MA

Average cloud cover in May - 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).

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Average visibility in May
Wellfleet, MA

Average visibility in May - 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).

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Wellfleet, Massachusetts, USA

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