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May Weather in Trail, United States

Last updated: June 24, 2025

In May, the average temperature in Trail, United States hovers around 12°C (54°F). However, be prepared for a range, as temperatures can dip to a brisk -2°C (29°F) or climb to a warm 30°C (86°F). Expect 59 mm (2.3 in) of precipitation over approximately 9 days, and note that the average humidity is a high 83%. Whether you're braving the chill or enjoying the warmth, Trail offers a diverse climate this month!

May Temperature in Trail

In May in Trail, the average temperature is 12°C (54°F), with maximums reaching 30°C (86°F) and minimums dropping to as low as -2°C (29°F). This makes it a great time to visit for those who enjoy mild weather, but be sure to pack for varying temperatures!

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

The chart illustrates May temperature patterns in Trail, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trail, May typically has an average temperature of 12°C (54°F), with highs reaching up to 30°C (86°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec373741475462696961504236
Data source: Temperature data for Trail 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 Trail

In Trail in May, the precipitation amount is 59 mm (2.3 in) over the course of 9 days.

May Precipitation Trends in Trail

The chart displays monthly precipitation patterns in Trail, 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 Trail, May typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1461701201115931175472117133
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Trail

In Trail in May humidity is 83%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket wrapping around you, making outdoor exploration feel sticky and uncomfortable, which can dampen the excitement of traveling.

May Average Humidity in Trail

This chart illustrates the average monthly humidity levels in Trail, 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 Trail is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Trail

In Trail in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Trail.

Maximum UV Index Levels in Trail for May

The chart shows the monthly maximum UV Index (UVI) for Trail 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 Trail typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478111110108642
Data source: Trail 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 Trail Compares to Other Months

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

This table compares monthly weather conditions in Trail, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)145 mm (5.7 inches)84%moderate
February Weather3°C (37°F)170 mm (6.7 inches)85%moderate
March Weather5°C (41°F)119 mm (4.7 inches)86%high
April Weather8°C (47°F)111 mm (4.4 inches)83%very high
May Weather12°C (54°F)59 mm (2.3 inches)83%extreme
June Weather17°C (62°F)31 mm (1.2 inches)83%extreme
July Weather21°C (70°F)1 mm (0.0 inches)78%very high
August Weather20°C (69°F)7 mm (0.3 inches)67%very high
September Weather16°C (61°F)54 mm (2.1 inches)66%very high
October Weather10°C (50°F)72 mm (2.8 inches)77%high
November Weather5°C (42°F)117 mm (4.6 inches)87%moderate
December Weather2°C (36°F)133 mm (5.2 inches)87%low

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