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May Weather in Williamsville, United States

Last updated: June 24, 2025

In May, the average temperature in Williamsville, United States is a comfortable 18°C (66°F), with a minimum dipping to 0°C (33°F) and a maximum soaring to 35°C (94°F). Expect 143 mm (5.6 in) of precipitation scattered over 16 days, contributing to an average humidity of 80%—perfect for those who enjoy a lush, green environment!

May Temperature in Williamsville

In May in Williamsville, the average temperature is 18°C (66°F). Maximums can reach 35°C (94°F), and minimums can be as low as 0°C (33°F). It's advisable to pack layers and be prepared for both warm days and chilly nights when traveling to Williamsville during this time.

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

The chart illustrates May temperature patterns in Williamsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williamsville, May typically has an average temperature of 18°C (66°F), with highs reaching up to 35°C (94°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec293143526575777471574236
Data source: Temperature data for Williamsville 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 Williamsville

In Williamsville in May, the precipitation amount is 143 mm (5.6 in) spread over 16 days.

May Precipitation Trends in Williamsville

The chart displays monthly precipitation patterns in Williamsville, 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 Williamsville, May typically receives around 143 mm (5.6 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec696913012814312411687641116852
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Williamsville

In Williamsville in May, humidity is 80%. With an average temperature of 18°C (66°F), this humidity feels like a warm, sticky embrace, making traveling slightly uncomfortable as perspiration builds up and the air feels heavy, causing an underlying lethargy.

May Average Humidity in Williamsville

This chart illustrates the average monthly humidity levels in Williamsville, 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 Williamsville is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Williamsville

In Williamsville 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 Williamsville.

Maximum UV Index Levels in Williamsville for May

The chart shows the monthly maximum UV Index (UVI) for Williamsville 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 Williamsville typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111198643
Data source: Williamsville 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 Williamsville Compares to Other Months

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

This table compares monthly weather conditions in Williamsville, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)69 mm (2.7 inches)84%moderate
February Weather0°C (32°F)69 mm (2.7 inches)82%moderate
March Weather6°C (44°F)129 mm (5.1 inches)84%high
April Weather11°C (53°F)128 mm (5.1 inches)83%very high
May Weather18°C (66°F)143 mm (5.6 inches)80%very high
June Weather24°C (75°F)124 mm (4.9 inches)83%extreme
July Weather25°C (77°F)116 mm (4.6 inches)82%extreme
August Weather23°C (74°F)87 mm (3.4 inches)82%very high
September Weather22°C (71°F)64 mm (2.5 inches)79%very high
October Weather14°C (58°F)111 mm (4.4 inches)79%high
November Weather5°C (42°F)68 mm (2.7 inches)88%moderate
December Weather2°C (36°F)52 mm (2.1 inches)87%moderate

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