May Weather in Plymouth, United States

Last updated: June 24, 2025

In Plymouth, United States, the average temperature in May hovers around 15°C (59°F). Daily highs can soar to 36°C (98°F), while chilly nights may dip to a brisk 0°C (32°F). Be prepared for about 120 mm (4.7 in) of precipitation over 11 days, and anticipate a humidity level of approximately 78%.

May Temperature in Plymouth

In May in Plymouth, the average temperature is 15°C (59°F). The maximum can reach 36°C (98°F) and the minimum can be as low as 0°C (32°F). It's essential to pack layers to ensure comfort for your travels in this variable climate.

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 15°C (59°F), with highs reaching up to 36°C (98°F) and lows dropping to around 0°C (32°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 120 mm (4.7 in) during a span of 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 120 mm (4.7 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 78%. With an average temperature of 15°C (59°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit more tiring and requiring frequent breaks for hydration as you explore the area.

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 78%, 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	-9°C (17°F)	26 mm (1.0 inches)	87%	low
February Weather	-9°C (17°F)	31 mm (1.2 inches)	90%	moderate
March Weather	0°C (33°F)	56 mm (2.2 inches)	85%	moderate
April Weather	6°C (43°F)	86 mm (3.4 inches)	84%	high
May Weather	15°C (59°F)	120 mm (4.7 inches)	78%	very high
June Weather	22°C (72°F)	84 mm (3.3 inches)	80%	very high
July Weather	24°C (75°F)	101 mm (4.0 inches)	81%	very high
August Weather	22°C (71°F)	146 mm (5.7 inches)	81%	very high
September Weather	18°C (64°F)	115 mm (4.5 inches)	81%	high
October Weather	9°C (48°F)	97 mm (3.8 inches)	84%	moderate
November Weather	1°C (33°F)	34 mm (1.4 inches)	88%	moderate
December Weather	-5°C (23°F)	47 mm (1.9 inches)	84%	low