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May Weather in Union, United States

Last updated: June 24, 2025

In May, the average temperature in Union, United States hovers around 17°C (62°F). Be prepared for a range, as temperatures can dip as low as -2°C (29°F) and soar to a maximum of 30°C (87°F). Precipitation is also a factor, with an average of 131 mm (5.2 in) falling over 13 days, contributing to a high humidity level of 83%. Stay ready for an array of weather conditions!

May Temperature in Union

In May in Union, the average temperature is 17°C (62°F), with maximums reaching up to 30°C (87°F) and minimums dropping as low as -2°C (29°F). This range makes it important for travelers to pack for both warm and cool conditions to fully enjoy their visit.

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

The chart illustrates May temperature patterns in Union, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Union, May typically has an average temperature of 17°C (62°F), with highs reaching up to 30°C (87°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec343944536268737167574338
Data source: Temperature data for Union 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 Union

In Union in May, the precipitation amount is 131 mm (5.2 in) over the course of 13 days.

May Precipitation Trends in Union

The chart displays monthly precipitation patterns in Union, 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 Union, May typically receives around 131 mm (5.2 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec74124921131319369881021087095
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Union

In Union in May, humidity is 83%. With an average temperature of 17°C (62°F), this humidity feels like traveling through a thick blanket of warmth, making every step feel heavy and inviting frequent breaks to cool down and hydrate.

May Average Humidity in Union

This chart illustrates the average monthly humidity levels in Union, 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 Union is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Union

In Union 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 Union.

Maximum UV Index Levels in Union for May

The chart shows the monthly maximum UV Index (UVI) for Union 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 Union typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
Data source: Union 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 Union Compares to Other Months

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

This table compares monthly weather conditions in Union, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)74 mm (2.9 inches)87%moderate
February Weather4°C (40°F)124 mm (4.9 inches)87%high
March Weather7°C (44°F)92 mm (3.6 inches)86%very high
April Weather12°C (53°F)113 mm (4.5 inches)84%very high
May Weather17°C (62°F)131 mm (5.2 inches)83%extreme
June Weather20°C (69°F)93 mm (3.7 inches)83%extreme
July Weather23°C (73°F)69 mm (2.7 inches)79%extreme
August Weather22°C (72°F)88 mm (3.5 inches)66%very high
September Weather19°C (67°F)101 mm (4.0 inches)68%very high
October Weather14°C (57°F)108 mm (4.2 inches)78%high
November Weather6°C (43°F)70 mm (2.7 inches)89%moderate
December Weather3°C (39°F)95 mm (3.7 inches)86%moderate

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