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May Weather in Williamstown, United States

Last updated: June 24, 2025

In Williamstown, United States, the average temperature in May hovers around 19°C (66°F), with potential extremes ranging from a chilly 0°C (32°F) to a scorching 32°C (90°F). This month typically sees 131 mm (5.2 in) of precipitation over 15 days, contributing to an average humidity level of 81%. Prepare for a mix of wet and warm conditions!

May Temperature in Williamstown

In May in Williamstown, the average temperature is 19°C (66°F). Maximum temperatures can reach 32°C (90°F), while the minimum can drop as low as 0°C (32°F). This variation makes it essential for travelers to pack accordingly for both warm and cool conditions.

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

The chart illustrates May temperature patterns in Williamstown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williamstown, May typically has an average temperature of 19°C (66°F), with highs reaching up to 32°C (90°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec343846556673777570594439
Data source: Temperature data for Williamstown 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 Williamstown

In Williamstown in May, the precipitation amount is 131 mm (5.2 in) over a span of 15 days.

May Precipitation Trends in Williamstown

The chart displays monthly precipitation patterns in Williamstown, 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 Williamstown, May typically receives around 131 mm (5.2 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec821231331351311681198810710491116
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Williamstown

In Williamstown in May, humidity is 81%. With an average temperature of 19°C (66°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel both muggy and slightly stifling, often leading to a need for frequent breaks in the shade.

May Average Humidity in Williamstown

This chart illustrates the average monthly humidity levels in Williamstown, 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 Williamstown is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Williamstown

In Williamstown 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 Williamstown.

Maximum UV Index Levels in Williamstown for May

The chart shows the monthly maximum UV Index (UVI) for Williamstown 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 Williamstown typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
Data source: Williamstown 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 Williamstown Compares to Other Months

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

This table compares monthly weather conditions in Williamstown, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)82 mm (3.2 inches)88%moderate
February Weather4°C (39°F)122 mm (4.8 inches)88%moderate
March Weather8°C (46°F)133 mm (5.2 inches)87%high
April Weather13°C (55°F)135 mm (5.3 inches)85%very high
May Weather19°C (66°F)131 mm (5.2 inches)81%very high
June Weather23°C (73°F)167 mm (6.6 inches)82%very high
July Weather25°C (77°F)119 mm (4.7 inches)81%very high
August Weather24°C (75°F)88 mm (3.5 inches)73%very high
September Weather21°C (71°F)107 mm (4.2 inches)73%very high
October Weather15°C (60°F)104 mm (4.1 inches)78%high
November Weather7°C (45°F)91 mm (3.6 inches)89%moderate
December Weather4°C (40°F)116 mm (4.6 inches)87%moderate

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