May Weather in Greenwich, United States

Last updated: June 24, 2025

In Greenwich, United States, the average temperature in May hovers around 15°C (59°F). During this time, temperatures can range from a chilly 0°C (32°F) to a warm 33°C (92°F). Expect 89 mm (3.5 in) of precipitation spread over about 14 days, contributing to an average humidity of 76%. Perfect weather to experience the unique charm of the season!

May Temperature in Greenwich

In May in Greenwich, the average temperature is 15°C (59°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 0°C (32°F). This makes it a perfect time to enjoy a variety of outdoor activities while being prepared for both warm and cooler conditions.

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

The chart illustrates May temperature patterns in Greenwich, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Greenwich, May typically has an average temperature of 15°C (59°F), with highs reaching up to 33°C (92°F) and lows dropping to around 0°C (32°F).

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

May Precipitation in Greenwich

In Greenwich in May, the precipitation amount is 89 mm (3.5 in) over a span of 14 days.

May Precipitation Trends in Greenwich

The chart displays monthly precipitation patterns in Greenwich, 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 Greenwich, May typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 14 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 Greenwich

In Greenwich in May humidity is 76%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities less enjoyable and often leading to a quick sense of fatigue while traveling.

May Average Humidity in Greenwich

This chart illustrates the average monthly humidity levels in Greenwich, 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 Greenwich 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 Greenwich

In Greenwich 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 Greenwich.

Maximum UV Index Levels in Greenwich for May

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

Data source: Greenwich 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 Greenwich Compares to Other Months

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

This table compares monthly weather conditions in Greenwich, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	77 mm (3.0 inches)	89%	moderate
February Weather	-2°C (29°F)	95 mm (3.8 inches)	88%	moderate
March Weather	2°C (35°F)	79 mm (3.1 inches)	86%	high
April Weather	8°C (47°F)	121 mm (4.8 inches)	84%	very high
May Weather	15°C (59°F)	89 mm (3.5 inches)	76%	very high
June Weather	20°C (68°F)	82 mm (3.2 inches)	72%	very high
July Weather	23°C (73°F)	108 mm (4.3 inches)	66%	very high
August Weather	22°C (72°F)	80 mm (3.2 inches)	64%	very high
September Weather	18°C (64°F)	87 mm (3.4 inches)	72%	high
October Weather	12°C (53°F)	142 mm (5.6 inches)	81%	moderate
November Weather	4°C (39°F)	106 mm (4.2 inches)	87%	moderate
December Weather	-1°C (31°F)	99 mm (3.9 inches)	84%	low