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May Weather in New Haven, United States

Last updated: June 24, 2025

In New Haven, United States, the average temperature in May hovers around 20°C (68°F). Temperatures can vary significantly, with a minimum of 0°C (33°F) and reaching as high as 34°C (93°F). Expect 119 mm (4.7 in) of precipitation over approximately 15 days, alongside an average humidity of 82%.

May Temperature in New Haven

In May in New Haven, the average temperature is 20°C (68°F). Maximum temperatures can reach 34°C (93°F), while minimum temperatures can drop as low as 0°C (33°F). Be prepared for a range of weather, and pack accordingly for your travels!

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 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec374149576875787672614642
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 119 mm (4.7 in) over a span of 15 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 119 mm (4.7 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec9615013514411915711510412510889121
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 82%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit sluggish but surprisingly refreshing, as long as you take breaks in shaded areas to cool off.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109753
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 Weather3°C (37°F)96 mm (3.8 inches)87%moderate
February Weather5°C (41°F)150 mm (5.9 inches)86%moderate
March Weather9°C (49°F)135 mm (5.3 inches)86%high
April Weather14°C (57°F)144 mm (5.7 inches)82%very high
May Weather20°C (68°F)119 mm (4.7 inches)82%very high
June Weather24°C (75°F)157 mm (6.2 inches)83%extreme
July Weather26°C (79°F)115 mm (4.5 inches)80%extreme
August Weather25°C (77°F)104 mm (4.1 inches)74%very high
September Weather22°C (72°F)125 mm (4.9 inches)71%very high
October Weather16°C (61°F)108 mm (4.2 inches)78%high
November Weather8°C (46°F)89 mm (3.5 inches)88%moderate
December Weather6°C (42°F)121 mm (4.8 inches)88%moderate

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