May weather forecast
Plymouth, MA

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The white colonial houses in Plymouth, Massachusetts, with the US flag flying
The white colonial houses in Plymouth, Massachusetts, with the US flag flying

Weather in May

May in Plymouth, Massachusetts, brings extensive warmth and abundant daylight, setting the stage for summer to unfold. The city, now blooming in the spring brilliance, witnesses longer days and considerably warmer temperatures. This month is marked by no snowfall, heralding the official closure of the winter season. The shift in weather from April to May witnesses lush landscapes, bustling Plymouth harbors, and upbeat locals. The shared anticipation of the approaching summer season and the promise of sun-soaked days, only intensify the city’s joyous vibe.

Temperature

May's arrival in Plymouth coincides with a rise in the average high-temperature, moving from April's cool 52.2°F (11.2°C) to an enjoyable 61.5°F (16.4°C). In Plymouth, the May nights cool down to an average low of 50.4°F (10.2°C).

Humidity

In May, the average relative humidity in Plymouth is 78%.

Rainfall

In Plymouth, in May, during 13.2 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. In Plymouth, during the entire year, the rain falls for 132.2 days and collects up to 16.3" (414mm) of precipitation.

Snowfall

In Plymouth, snow does not fall in May through October.

Ocean temperature

In May, the average ocean temperature is 50.4°F (10.2°C).
Note: Danger awaits those who swim in 50.4°F (10.2°C) without protection. Falling below 50°F (10°C) means intense cold shock and hyperventilation.

Daylight

In Plymouth, the average length of the day in May is 14h and 35min.
On the first day of the month, sunrise is at 5:37 am and sunset at 7:41 pm. On the last day of May, sunrise is at 5:09 am and sunset at 8:11 pm EDT.

Sunshine

In May, the average sunshine is 8.5h.

UV index

The average daily maximum UV index in May in Plymouth is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 5 in May converts into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Updated: Jul 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in May?

The high-temperature, in May, in Plymouth, is 61.5°F (16.4°C), while the low-temperature averages to 50.4°F (10.2°C).

What is the average humidity in May in Plymouth?

The average relative humidity in May is 78%.

How many days does it rain in May?

In May, the rain falls for 13.2 days. Throughout May, 1.34" (34mm) of precipitation is accumulated.

When it does not snow?

May through October are months without snowfall.

Does it snow in May?

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

What is the ocean temperature in May?

In Plymouth, the average seawater temperature in May is 50.4°F (10.2°C). Swimming in 50.4°F (10.2°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 May, the average day length is 14h and 35min.

When is the sunrise / sunset in May?

On the first day of May, sunrise is at 5:37 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 5:09 am and sunset at 8:11 pm EDT.

How many hours of sunshine does Plymouth have in May?

The average sunshine duration in May is 8.5h.

What is the UV index intensity in May?

In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMayJJASOND
Apr
May
Jun
Average high temperature
52.2°F 11.2°C
61.5°F 16.4°C
69.6°F 20.9°C
Average low temperature
41.5°F 5.3°C
50.4°F 10.2°C
58.1°F 14.5°C
Average pressure
29.98" 761mmHg
30.01" 762mmHg
29.93" 760mmHg
Average wind speed
10.7mph 17.2km/h
9.3mph 15km/h
8.6mph 13.8km/h
Average max. wind speed
11.4mph 18.3km/h
9.9mph 15.9km/h
9.2mph 14.8km/h
Average wind speed gusts
17.6mph 28.3km/h
15.7mph 25.3km/h
14.7mph 23.7km/h
Average humidity
74%
78%
79%
Average rainfall
1.46" 37mm
1.34" 34mm
1.46" 37mm
Average rainfall days
13
13.2
13.3
Average snowfall
0.35" 9mm
0" 0mm
0" 0mm
Average snowfall days
0.8
0
0
Average sea temperature
44°F 6.7°C
50.4°F 10.2°C
58.6°F 14.8°C
Average daylight
13h 2min
14h 4min
15h 1min
Average sunshine
8h 2min
8h 3min
9h 2min
Average sunshine days
14.9
15.3
14.9
Average UV index
3
5
6
Average cloud cover
46%
44%
39%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in May
Plymouth, MA

Average temperature in May - Plymouth, MA
  • Average high temperature in May: 61.5°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in May: 50.4°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average pressure in May
Plymouth, MA

Average pressure in May - Plymouth, MA
  • Average pressure in May: 30.01"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
Plymouth, MA

Average wind speed in May - Plymouth, MA
  • Average wind speed in May: 9.3mph

The windiest month (with the highest average wind speed) is January (12.3mph).
The calmest month (with the lowest average wind speed) is August (7.8mph).

Average humidity in May
Plymouth, MA

Average humidity in May - Plymouth, MA
  • Average humidity in May: 78%

The month with the highest relative humidity is July (80%).
The months with the lowest relative humidity are March, April and November (74%).

Average rainfall in May
Plymouth, MA

Average rainfall in May - Plymouth, MA
  • Average rainfall in May: 1.34"

The wettest months (with the highest rainfall) are July and October (1.65").
The driest month (with the least rainfall) is February (1.02").

Average rainfall days in May
Plymouth, MA

Average rainfall days in May - Plymouth, MA
  • Average rainfall days in May: 13.2 days

The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is January (7.4 days).

Average snowfall in May
Plymouth, MA

Average snowfall in May - Plymouth, MA
  • Average snowfall in May: 0"

The month with the highest snowfall is March (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in May
Plymouth, MA

Average snowfall days in May - Plymouth, MA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in May
Plymouth, MA

Average sea temperature in May - Plymouth, MA
  • Average sea temperature in May: 50.4°F

The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).

Average daylight in May /
Average sunshine in May
Plymouth, MA

Average daylight in May / Average sunshine in May - Plymouth, 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 3min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).

Average sunshine days in May
Plymouth, MA

Average sunshine days in May - Plymouth, MA
  • Average sunshine days in May: 15.3 days

The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is July (14.8 days).

Average UV index in May
Plymouth, MA

Average UV index in May - Plymouth, MA
  • Average UV index in May: 5

The months with the highest UV index are June, 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
Plymouth, MA

Average cloud cover in May - Plymouth, MA
  • Average cloud cover in May: 44

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in May
Plymouth, MA

Average visibility in May - Plymouth, 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).

Plymouth, Massachusetts, USA

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