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May Weather in Calais, United States

Last updated: June 24, 2025

In May, the average temperature in Calais, United States is a comfortable 11°C (53°F). However, brace yourself for a range: the minimum can dip to -1°C (31°F), while the maximum can soar to 32°C (90°F). You'll also want to be prepared for 107 mm (4.2 in) of rainfall spread over 12 days, contributing to an average humidity of 78%. Stay cozy and dry this month!

May Temperature in Calais

In May in Calais, the average temperature is 11°C (53°F). The maximum can reach 32°C (90°F) and the minimum can be as low as -1°C (31°F). This wide range makes Calais an ideal destination for travelers seeking both warm and cool experiences during their visit.

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

The chart illustrates May temperature patterns in Calais, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Calais, May typically has an average temperature of 11°C (53°F), with highs reaching up to 32°C (90°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec212330425262686860503726
Data source: Temperature data for Calais 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 Calais

In Calais in May, the precipitation amount is 107 mm (4.2 in) spread over 12 days.

May Precipitation Trends in Calais

The chart displays monthly precipitation patterns in Calais, 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 Calais, May typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec99907212010791917688109136122
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Calais

In Calais in May, humidity is 78%. With an average temperature of 11°C (53°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities somewhat uncomfortable as you navigate through the unpredictable weather.

May Average Humidity in Calais

This chart illustrates the average monthly humidity levels in Calais, 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 Calais is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%84%82%80%78%82%84%82%82%82%84%82%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Calais

In Calais in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Calais.

Maximum UV Index Levels in Calais for May

The chart shows the monthly maximum UV Index (UVI) for Calais 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 Calais typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245799887532
Data source: Calais 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 Calais Compares to Other Months

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

This table compares monthly weather conditions in Calais, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)98 mm (3.9 inches)83%low
February Weather-5°C (23°F)90 mm (3.5 inches)84%moderate
March Weather-1°C (30°F)72 mm (2.8 inches)82%moderate
April Weather5°C (42°F)119 mm (4.7 inches)80%high
May Weather11°C (53°F)107 mm (4.2 inches)78%very high
June Weather17°C (62°F)91 mm (3.6 inches)82%very high
July Weather20°C (68°F)91 mm (3.6 inches)84%very high
August Weather20°C (68°F)76 mm (3.0 inches)82%very high
September Weather16°C (61°F)88 mm (3.5 inches)82%high
October Weather10°C (50°F)109 mm (4.3 inches)82%moderate
November Weather3°C (37°F)136 mm (5.4 inches)84%moderate
December Weather-3°C (26°F)122 mm (4.8 inches)82%low

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