May Weather in Union, Guatemala

Last updated: August 23, 2025

In May, the average temperature in Union, Guatemala is a comfortable 21°C (71°F). Visitors can expect temperatures to range from a cool 13°C (56°F) at night to a warm 32°C (90°F) during the day. The area experiences an average of 139 mm (5.5 in) of precipitation over 18 days, accompanied by a moderate humidity level of 65%. Enjoy the pleasant climate while exploring all that this destination has to offer!

May Temperature in Union

In May in Union, the average temperature is 21°C (71°F), with maximums reaching 32°C (90°F) and minimums dropping as low as 13°C (56°F). This makes it a perfect time to explore the outdoors and enjoy various activities in Union.

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 21°C (71°F), with highs reaching up to 32°C (90°F) and lows dropping to around 13°C (56°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 139 mm (5.5 in) over the course of 18 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 139 mm (5.5 inches) of precipitation spread over approximately 18 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 65%. With an average temperature of 21°C (71°F), this humidity feels like a warm, enveloping blanket, making outdoor activities pleasant yet requiring occasional breaks in the shade to stay comfortable while exploring.

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 65%, 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 an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, 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 15, 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	17°C (62°F)	27 mm (1.1 inches)	76%	extreme
February Weather	18°C (64°F)	16 mm (0.6 inches)	68%	extreme
March Weather	19°C (66°F)	14 mm (0.5 inches)	59%	extreme
April Weather	21°C (70°F)	22 mm (0.9 inches)	57%	extreme
May Weather	21°C (71°F)	139 mm (5.5 inches)	65%	extreme
June Weather	20°C (69°F)	353 mm (13.9 inches)	66%	extreme
July Weather	20°C (68°F)	146 mm (5.7 inches)	75%	extreme
August Weather	20°C (68°F)	263 mm (10.4 inches)	82%	extreme
September Weather	20°C (68°F)	331 mm (13.0 inches)	82%	extreme
October Weather	19°C (67°F)	226 mm (8.9 inches)	83%	extreme
November Weather	18°C (65°F)	76 mm (3.0 inches)	80%	extreme
December Weather	17°C (63°F)	25 mm (1.0 inches)	76%	very high