May Weather in Union, United States

Last updated: June 24, 2025

In May, the average temperature in Union, United States hovers around 25°C (77°F). Expect a minimum of 11°C (53°F) and a warm maximum of 36°C (97°F). With an average humidity level of 77%, you can anticipate a sticky atmosphere. Rain lovers take note: the area experiences about 138 mm (5.4 in) of precipitation spread over 11 days.

May Temperature in Union

In May in Union, the average temperature is 25°C (77°F). Maximum temperatures can reach 36°C (97°F), while minimums can drop to as low as 11°C (53°F). This makes Union an ideal destination for travelers seeking comfortable weather with warm days and cooler evenings.

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 25°C (77°F), with highs reaching up to 36°C (97°F) and lows dropping to around 11°C (53°F).

Data source: Temperature data for Union generated using information from the Copernicus Climate Change Service.

May Precipitation in Union

In Union in May, the precipitation amount is 138 mm (5.4 in) distributed over 11 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 138 mm (5.4 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Union

In Union in May, humidity is 77%. With an average temperature of 25°C (77°F), this humidity feels like a warm blanket wrapping around you, making travel feel slightly heavy but still pleasant, as long as you stay hydrated and take frequent breaks in the shade.

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 77%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	95 mm (3.8 inches)	81%	moderate
February Weather	15°C (60°F)	112 mm (4.4 inches)	81%	very high
March Weather	18°C (65°F)	69 mm (2.7 inches)	79%	very high
April Weather	21°C (69°F)	118 mm (4.6 inches)	81%	extreme
May Weather	25°C (77°F)	138 mm (5.4 inches)	77%	extreme
June Weather	27°C (81°F)	207 mm (8.2 inches)	74%	extreme
July Weather	28°C (82°F)	220 mm (8.7 inches)	74%	extreme
August Weather	28°C (82°F)	220 mm (8.7 inches)	73%	extreme
September Weather	26°C (80°F)	166 mm (6.5 inches)	79%	extreme
October Weather	23°C (73°F)	118 mm (4.6 inches)	77%	very high
November Weather	16°C (61°F)	67 mm (2.6 inches)	81%	high
December Weather	14°C (58°F)	105 mm (4.1 inches)	84%	moderate