May Weather in San Marcos, Mexico

Last updated: August 27, 2025

In May, the average temperature in San Marcos, Mexico reaches a pleasant 23°C (73°F). However, be prepared for fluctuations, as temperatures can dip to a chilly 9°C (48°F) or soar to a maximum of 36°C (97°F). During this time, expect about 14 mm (0.5 in) of precipitation spread over 3 days, contributing to an average humidity of 51%. Enjoy your stay while staying weather-ready!

May Temperature in San Marcos

In May in San Marcos, the average temperature is 23°C (73°F). Maximums can reach 36°C (97°F), while minimums can drop as low as 9°C (48°F). This diverse temperature range makes it essential for travelers to pack both light and warm clothing to enjoy their visit comfortably.

May Weather in San Marcos: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Marcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcos, May typically has an average temperature of 23°C (73°F), with highs reaching up to 36°C (97°F) and lows dropping to around 9°C (48°F).

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

May Precipitation in San Marcos

In San Marcos in May, the precipitation amount is 14 mm (0.5 in) over the course of 3 days.

May Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, 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 San Marcos, May typically receives around 14 mm (0.5 inches) of precipitation spread over approximately 3 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in San Marcos

In San Marcos in May, humidity is 51%. With an average temperature of 23°C (73°F), this humidity feels like a refreshing embrace, making it pleasant for exploring the local sights without feeling overly sticky or uncomfortable.

May Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, 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 San Marcos is approximately 51%, 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 San Marcos

In San Marcos in May, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Marcos, you can check here.

Maximum UV Index Levels in San Marcos for May

The chart shows the monthly maximum UV Index (UVI) for San Marcos 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 San Marcos typically reaches 14, which falls under the extreme exposure category.

Data source: San Marcos 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 San Marcos Compares to Other Months

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

This table compares monthly weather conditions in San Marcos, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	16°C (62°F)	13 mm (0.5 inches)	64%	very high
February Weather	17°C (64°F)	21 mm (0.8 inches)	57%	extreme
March Weather	20°C (68°F)	3 mm (0.1 inches)	46%	extreme
April Weather	21°C (70°F)	1 mm (0.0 inches)	42%	extreme
May Weather	23°C (73°F)	14 mm (0.5 inches)	51%	extreme
June Weather	23°C (73°F)	113 mm (4.4 inches)	74%	extreme
July Weather	21°C (70°F)	252 mm (9.9 inches)	79%	extreme
August Weather	21°C (71°F)	248 mm (9.8 inches)	81%	extreme
September Weather	21°C (70°F)	267 mm (10.5 inches)	84%	extreme
October Weather	21°C (70°F)	99 mm (3.9 inches)	75%	extreme
November Weather	19°C (66°F)	19 mm (0.7 inches)	71%	very high
December Weather	16°C (62°F)	15 mm (0.6 inches)	74%	very high