July Weather in San Marcos, Mexico

Last updated: August 27, 2025

In San Marcos, Mexico, the average temperature in July hovers around 19°C (67°F). Expect a minimum of 11°C (53°F) and a maximum of 31°C (88°F), offering a pleasant range for outdoor activities. However, be prepared for some rain, as precipitation totals reach 164 mm (6.5 in) over the course of 19 days. With an average humidity of 67%, the climate remains comfortably mild throughout the month.

July Temperature in San Marcos

In July in San Marcos, the average temperature is 19°C (67°F). The maximum can reach 31°C (88°F), while the minimum can drop to as low as 11°C (53°F). This climate offers a pleasant mix of warmth and cooler evenings, making it an ideal time for outdoor adventures and exploration.

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

The chart illustrates July 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, July typically has an average temperature of 19°C (67°F), with highs reaching up to 31°C (88°F) and lows dropping to around 11°C (53°F).

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

July Precipitation in San Marcos

In San Marcos in July, the precipitation amount is 164 mm (6.5 in) over the course of 19 days.

July Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In San Marcos, July typically receives around 164 mm (6.5 inches) of precipitation spread over approximately 19 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

July Humidity in San Marcos

In San Marcos in July, humidity is 67%. With an average temperature of 19°C (67°F), this humidity feels like walking through a warm, soft blanket, making sightseeing and outdoor activities a bit more challenging but still enjoyable for those prepared with light clothing and plenty of hydration.

July Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in San Marcos is approximately 67%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in San Marcos

In San Marcos in July, 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 July

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

Data source: San Marcos July 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 July 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 July’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 July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	14°C (58°F)	4 mm (0.2 inches)	74%	very high
February Weather	17°C (62°F)	7 mm (0.3 inches)	65%	extreme
March Weather	19°C (67°F)	11 mm (0.4 inches)	58%	extreme
April Weather	21°C (71°F)	5 mm (0.2 inches)	58%	extreme
May Weather	22°C (73°F)	46 mm (1.8 inches)	67%	extreme
June Weather	21°C (70°F)	172 mm (6.8 inches)	76%	extreme
July Weather	19°C (67°F)	164 mm (6.5 inches)	67%	extreme
August Weather	20°C (68°F)	153 mm (6.0 inches)	68%	extreme
September Weather	19°C (66°F)	160 mm (6.3 inches)	81%	extreme
October Weather	18°C (65°F)	63 mm (2.5 inches)	83%	extreme
November Weather	16°C (61°F)	19 mm (0.8 inches)	84%	very high
December Weather	14°C (58°F)	4 mm (0.2 inches)	81%	very high