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May Weather in New Haven, United States

Last updated: June 24, 2025

In May, the average temperature in New Haven, United States is a mild 14°C (57°F), with a minimum of 2°C (37°F) and peaking at a comfortable 25°C (77°F). Expect around 130 mm (5.1 in) of precipitation spread over 13 days, contributing to an average humidity of 69%. Be prepared for a blend of cozy and refreshing days!

May Temperature in New Haven

In May in New Haven, the average temperature is 14°C (57°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop to as low as 2°C (37°F). This mild climate makes New Haven an ideal destination for travelers seeking comfortable weather.

May Weather in New Haven: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in New Haven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New Haven, May typically has an average temperature of 14°C (57°F), with highs reaching up to 25°C (77°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec333539475766747468604738
Data source: Temperature data for New Haven 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 New Haven

In New Haven in May, the precipitation amount is 130 mm (5.1 in) spread over 13 days.

May Precipitation Trends in New Haven

The chart displays monthly precipitation patterns in New Haven, 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 New Haven, May typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec901321091531309313297108171112160
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in New Haven

In New Haven in May, humidity is 69%. With an average temperature of 14°C (57°F), this humidity feels like a mild blanket wrapping around you, making outdoor activities slightly uncomfortable but manageable for traveling, especially if you stay hydrated and take breaks in shaded areas.

May Average Humidity in New Haven

This chart illustrates the average monthly humidity levels in New Haven, 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 New Haven 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 New Haven

In New Haven 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 New Haven.

Maximum UV Index Levels in New Haven for May

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

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

This table compares monthly weather conditions in New Haven, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)90 mm (3.5 inches)84%moderate
February Weather1°C (35°F)132 mm (5.2 inches)82%moderate
March Weather4°C (39°F)109 mm (4.3 inches)81%high
April Weather8°C (47°F)153 mm (6.0 inches)78%very high
May Weather14°C (57°F)130 mm (5.1 inches)69%very high
June Weather19°C (67°F)93 mm (3.7 inches)69%very high
July Weather23°C (74°F)132 mm (5.2 inches)62%very high
August Weather23°C (74°F)96 mm (3.8 inches)65%very high
September Weather20°C (69°F)108 mm (4.3 inches)68%very high
October Weather15°C (60°F)171 mm (6.7 inches)74%high
November Weather8°C (47°F)112 mm (4.4 inches)82%moderate
December Weather4°C (39°F)160 mm (6.3 inches)80%low

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