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May Weather in Old Greenwich, United States

Last updated: June 24, 2025

In May, the average temperature in Old Greenwich, United States is 15°C (60°F). You can expect a range from a minimum of 2°C (36°F) to a maximum of 31°C (87°F). With an average precipitation of 112 mm (4.4 in) over 12 days, it's a month to prepare for a bit of rain! Humidity hovers around 69%, making for a pleasantly mild atmosphere.

May Temperature in Old Greenwich

In May in Old Greenwich, the average temperature is 15°C (60°F). Maximums can reach 31°C (87°F), while minimums can be as low as 2°C (36°F). It's a great time to visit Old Greenwich if you enjoy mild weather with a chance of warmer days!

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

The chart illustrates May temperature patterns in Old Greenwich, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Old Greenwich, May typically has an average temperature of 15°C (60°F), with highs reaching up to 31°C (87°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec333540506070777569604638
Data source: Temperature data for Old 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 Old Greenwich

In Old Greenwich in May, the total precipitation amount is 112 mm (4.4 in), falling over the course of 12 days.

May Precipitation Trends in Old Greenwich

The chart displays monthly precipitation patterns in Old 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 Old Greenwich, May typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec6910193116112941391189313190114
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Old Greenwich

In Old Greenwich in May, humidity is 69%. With an average temperature of 15°C (60°F), this humidity feels like a cool, damp embrace that can make outdoor activities feel slightly heavier and more exhausting, but still inviting for exploring the charming sights and sounds of the area.

May Average Humidity in Old Greenwich

This chart illustrates the average monthly humidity levels in Old 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 Old Greenwich is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Old Greenwich

In Old 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 Old Greenwich.

Maximum UV Index Levels in Old Greenwich for May

The chart shows the monthly maximum UV Index (UVI) for Old 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 Old Greenwich typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35681010998642
Data source: Old 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 Old Greenwich Compares to Other Months

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

This table compares monthly weather conditions in Old Greenwich, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)69 mm (2.7 inches)84%moderate
February Weather2°C (36°F)101 mm (4.0 inches)82%moderate
March Weather5°C (41°F)93 mm (3.7 inches)81%high
April Weather10°C (50°F)116 mm (4.6 inches)78%very high
May Weather15°C (60°F)112 mm (4.4 inches)69%very high
June Weather21°C (70°F)93 mm (3.7 inches)69%very high
July Weather25°C (77°F)139 mm (5.5 inches)62%very high
August Weather24°C (75°F)118 mm (4.6 inches)65%very high
September Weather21°C (69°F)93 mm (3.6 inches)68%very high
October Weather15°C (60°F)131 mm (5.2 inches)74%high
November Weather8°C (47°F)90 mm (3.6 inches)82%moderate
December Weather3°C (39°F)113 mm (4.5 inches)80%low

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