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May Weather in Greenwich, United States

Last updated: June 24, 2025

In May, the average temperature in Greenwich, United States hovers around 16°C (62°F). Expect a wide range, with minimums dipping to -2°C (29°F) and maximums soaring up to 33°C (91°F). The region experiences an average precipitation of 129 mm (5.1 in) spread across 15 days, leading to a notable average humidity of 81%.

May Temperature in Greenwich

In May in Greenwich, the average temperature is 16°C (62°F), with maximums reaching 33°C (91°F) and minimums dropping as low as -2°C (29°F). It's a season of diverse weather, so travelers should be prepared for both warm days and chilly nights in order to make the most of their visit.

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 16°C (62°F), with highs reaching up to 33°C (91°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec293240506270747267564134
Data source: Temperature data for Greenwich generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Greenwich

In Greenwich in May, the precipitation amount is 129 mm (5.1 in) over a span of 15 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 129 mm (5.1 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec7892971231291361289179968884
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Greenwich

In Greenwich in May, humidity is 81%. With an average temperature of 16°C (62°F), this humidity feels like a warm embrace that can quickly leave travelers feeling sticky and drained, making outdoor adventures a bit challenging unless they stay properly hydrated and take breaks in the shade.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
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.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)78 mm (3.1 inches)88%moderate
February Weather0°C (32°F)92 mm (3.6 inches)87%moderate
March Weather4°C (40°F)97 mm (3.8 inches)87%high
April Weather10°C (50°F)123 mm (4.8 inches)87%very high
May Weather16°C (62°F)129 mm (5.1 inches)81%very high
June Weather21°C (71°F)136 mm (5.4 inches)82%very high
July Weather24°C (75°F)128 mm (5.0 inches)81%very high
August Weather22°C (72°F)91 mm (3.6 inches)78%very high
September Weather20°C (67°F)79 mm (3.1 inches)78%very high
October Weather14°C (57°F)96 mm (3.8 inches)82%high
November Weather5°C (41°F)88 mm (3.4 inches)89%moderate
December Weather1°C (35°F)84 mm (3.3 inches)86%low

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