May Weather in Groton, United States

Last updated: June 24, 2025

In Groton, United States, the average temperature in May hovers around 14°C (57°F). Temperatures can range from a chilly -2°C (29°F) to a sweltering 36°C (97°F), offering a diverse experience for visitors. Expect about 64 mm (2.5 in) of precipitation spread over 10 days, accompanied by an average humidity of 76%, creating a distinct climate that influences the local atmosphere.

May Temperature in Groton

In May in Groton, the average temperature is 14°C (57°F). Maximum temperatures can reach 36°C (97°F) while minimums can drop as low as -2°C (29°F). Be prepared for a wide range of weather conditions during your travels!

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

The chart illustrates May temperature patterns in Groton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Groton, May typically has an average temperature of 14°C (57°F), with highs reaching up to 36°C (97°F) and lows dropping to around -2°C (29°F).

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

May Precipitation in Groton

In Groton in May, the precipitation amount is 64 mm (2.5 in) over a span of 10 days.

May Precipitation Trends in Groton

The chart displays monthly precipitation patterns in Groton, 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 Groton, May typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 10 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 Groton

In Groton in May humidity is 76%. With an average temperature of 14°C (57°F), this humidity feels like a warm blanket wrapped around you, creating a heavy atmosphere that can make outdoor activities feel sluggish and stifling, urging travelers to seek shade and refreshment more frequently.

May Average Humidity in Groton

This chart illustrates the average monthly humidity levels in Groton, 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 Groton is approximately 76%, 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 Groton

In Groton 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 Groton.

Maximum UV Index Levels in Groton for May

The chart shows the monthly maximum UV Index (UVI) for Groton 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 Groton typically reaches 9, which falls under the very high exposure category.

Data source: Groton 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 Groton Compares to Other Months

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

This table compares monthly weather conditions in Groton, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	18 mm (0.7 inches)	81%	moderate
February Weather	-10°C (14°F)	16 mm (0.6 inches)	85%	moderate
March Weather	-1°C (31°F)	35 mm (1.4 inches)	76%	moderate
April Weather	5°C (41°F)	47 mm (1.9 inches)	79%	high
May Weather	14°C (57°F)	64 mm (2.5 inches)	76%	very high
June Weather	22°C (71°F)	65 mm (2.6 inches)	81%	very high
July Weather	24°C (75°F)	76 mm (3.0 inches)	82%	very high
August Weather	21°C (71°F)	108 mm (4.2 inches)	82%	very high
September Weather	17°C (63°F)	88 mm (3.5 inches)	77%	high
October Weather	8°C (46°F)	76 mm (3.0 inches)	76%	moderate
November Weather	0°C (33°F)	17 mm (0.7 inches)	84%	moderate
December Weather	-5°C (23°F)	33 mm (1.3 inches)	81%	low