May Weather in Plymouth, United States

Last updated: June 24, 2025

In May, the average temperature in Plymouth, United States hovers around 17°C (62°F), but be prepared for fluctuations, as it can drop to a chilly -2°C (29°F) or soar to a warm 34°C (94°F). Expect 151 mm (6.0 in) of precipitation spread over about 15 days, contributing to a humid atmosphere with an average humidity of 81%. Plan accordingly to make the most of your visit!

May Temperature in Plymouth

In May in Plymouth, the average temperature is 17°C (62°F). Maximums can reach up to 34°C (94°F), while minimums can dip as low as -2°C (29°F). Be prepared for a wide range of temperatures when planning your travel to Plymouth in May.

May Weather in Plymouth: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Plymouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Plymouth, May typically has an average temperature of 17°C (62°F), with highs reaching up to 34°C (94°F) and lows dropping to around -2°C (29°F).

Data source: Temperature data for Plymouth generated using information from the Copernicus Climate Change Service.

May Precipitation in Plymouth

In Plymouth in May, the precipitation amount is 151 mm (6.0 in) spread over 15 days.

May Precipitation Trends in Plymouth

The chart displays monthly precipitation patterns in Plymouth, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Plymouth, May typically receives around 151 mm (6.0 inches) of precipitation spread over approximately 15 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Plymouth

In Plymouth in May, humidity is 81%. With an average temperature of 17°C (62°F), this humidity feels like a warm blanket enveloping you, making outdoor adventures feel sticky and requiring frequent breaks to stay comfortable while exploring.

May Average Humidity in Plymouth

This chart illustrates the average monthly humidity levels in Plymouth, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Plymouth is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Plymouth

In Plymouth in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Plymouth.

Maximum UV Index Levels in Plymouth for May

The chart shows the monthly maximum UV Index (UVI) for Plymouth in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Plymouth typically reaches 9, which falls under the very high exposure category.

Data source: Plymouth May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in Plymouth Compares to Other Months

Weather in Plymouth varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Plymouth, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Plymouth, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	73 mm (2.9 inches)	85%	moderate
February Weather	-1°C (30°F)	76 mm (3.0 inches)	85%	moderate
March Weather	4°C (40°F)	102 mm (4.0 inches)	86%	high
April Weather	10°C (50°F)	103 mm (4.0 inches)	87%	very high
May Weather	17°C (62°F)	151 mm (6.0 inches)	81%	very high
June Weather	22°C (73°F)	116 mm (4.5 inches)	82%	very high
July Weather	24°C (76°F)	116 mm (4.6 inches)	81%	very high
August Weather	23°C (73°F)	101 mm (4.0 inches)	79%	very high
September Weather	20°C (68°F)	73 mm (2.9 inches)	78%	very high
October Weather	13°C (56°F)	118 mm (4.6 inches)	81%	high
November Weather	5°C (41°F)	78 mm (3.1 inches)	89%	moderate
December Weather	1°C (34°F)	61 mm (2.4 inches)	86%	low