July Weather in San Marcos, Mexico

Last updated: August 27, 2025

In July, the average temperature in San Marcos, Mexico is a pleasant 20°C (69°F), with daily highs reaching up to 32°C (90°F) and lows dropping to 12°C (55°F). While you enjoy the warmth, expect about 136 mm (5.4 in) of precipitation spread over 15 days, contributing to an average humidity of 73%. Stay prepared for both sunshine and occasional showers!

July Temperature in San Marcos

In July in San Marcos, the average temperature is 20°C (69°F), with maximums reaching 32°C (90°F) and minimums dropping to as low as 12°C (55°F). It's a perfect time for travelers to enjoy pleasant weather while exploring the local attractions.

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 20°C (69°F), with highs reaching up to 32°C (90°F) and lows dropping to around 12°C (55°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 136 mm (5.4 in) over a period of 15 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 136 mm (5.4 inches) of precipitation spread over approximately 15 days.

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

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Millimeters (mm) Inches (in)

July Humidity in San Marcos

In San Marcos in July humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

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 73%, 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	12°C (54°F)	12 mm (0.5 inches)	70%	very high
February Weather	15°C (59°F)	10 mm (0.4 inches)	62%	extreme
March Weather	18°C (64°F)	11 mm (0.4 inches)	53%	extreme
April Weather	20°C (68°F)	9 mm (0.4 inches)	48%	extreme
May Weather	22°C (73°F)	15 mm (0.6 inches)	52%	extreme
June Weather	22°C (73°F)	52 mm (2.1 inches)	64%	extreme
July Weather	20°C (69°F)	136 mm (5.4 inches)	73%	extreme
August Weather	21°C (70°F)	67 mm (2.6 inches)	71%	extreme
September Weather	18°C (65°F)	125 mm (4.9 inches)	82%	extreme
October Weather	18°C (64°F)	43 mm (1.7 inches)	83%	extreme
November Weather	15°C (59°F)	10 mm (0.4 inches)	82%	very high
December Weather	12°C (55°F)	9 mm (0.3 inches)	84%	high