May Weather in Plymouth, United States

Last updated: June 24, 2025

In Plymouth, United States, the average temperature in May hovers around 21°C (70°F), with minimums dipping to 5°C (41°F) and glorious highs reaching up to 36°C (97°F). Expect around 114 mm (4.5 in) of precipitation spread over 11 days, contributing to an average humidity of 81%. Get ready for a balancing act of warmth and moisture!

May Temperature in Plymouth

In May in Plymouth, the average temperature is 21°C (70°F). Maximums can reach 36°C (97°F), and minimums can dip as low as 5°C (41°F). It's a great time to visit for those who enjoy mild weather with the possibility of warm days and cool evenings.

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 21°C (70°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (41°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 total precipitation amount is 114 mm (4.5 in) spread over 11 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 114 mm (4.5 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Plymouth

In Plymouth in May, humidity is 81%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace, making outdoor activities slightly uncomfortable and necessitating frequent breaks in the shade or air conditioning for a refreshing escape.

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 reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme 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	7°C (45°F)	90 mm (3.5 inches)	84%	moderate
February Weather	10°C (50°F)	95 mm (3.7 inches)	81%	high
March Weather	12°C (53°F)	64 mm (2.5 inches)	80%	very high
April Weather	17°C (62°F)	100 mm (3.9 inches)	80%	very high
May Weather	21°C (70°F)	114 mm (4.5 inches)	81%	extreme
June Weather	25°C (76°F)	149 mm (5.9 inches)	82%	very high
July Weather	27°C (80°F)	141 mm (5.5 inches)	83%	extreme
August Weather	26°C (79°F)	170 mm (6.7 inches)	82%	very high
September Weather	24°C (75°F)	125 mm (4.9 inches)	80%	very high
October Weather	19°C (67°F)	75 mm (2.9 inches)	79%	very high
November Weather	12°C (54°F)	96 mm (3.8 inches)	83%	moderate
December Weather	9°C (49°F)	108 mm (4.2 inches)	84%	moderate