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July Weather in San Marcos, Mexico

Last updated: August 27, 2025

In July, the average temperature in San Marcos, Mexico is a pleasant 18°C (65°F). However, you might experience a minimum of 11°C (51°F) and a maximum of 29°C (85°F). Be prepared for some rain, as precipitation totals around 108 mm (4.3 in) spread over 19 days. With an average humidity of 68%, the air can feel quite warm and humid, making it essential to stay hydrated and comfortable during your stay.

July Temperature in San Marcos

In July in San Marcos, the average temperature is 18°C (65°F). Maximums can reach 29°C (85°F), and minimums can be as low as 11°C (51°F). This makes it an ideal 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 18°C (65°F), with highs reaching up to 29°C (85°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec566064676966656564625957
Data source: Temperature data for San Marcos generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

July Precipitation in San Marcos

In San Marcos in July, the precipitation amount is 108 mm (4.3 in) spread over 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 108 mm (4.3 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec8718253612410811514469174
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in San Marcos

In San Marcos in July, humidity is 68%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel somewhat sticky and requiring occasional breaks for refreshing 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 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%78%75%71%77%76%68%70%82%91%89%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec9121415151414141412108
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.
 TemperaturePrecipitationHumidityUV
January Weather13°C (57°F)8 mm (0.3 inches)84%very high
February Weather16°C (61°F)7 mm (0.3 inches)78%extreme
March Weather18°C (64°F)18 mm (0.7 inches)75%extreme
April Weather20°C (68°F)25 mm (1.0 inches)70%extreme
May Weather21°C (69°F)36 mm (1.4 inches)77%extreme
June Weather19°C (67°F)124 mm (4.9 inches)76%extreme
July Weather18°C (65°F)108 mm (4.3 inches)68%extreme
August Weather18°C (65°F)115 mm (4.5 inches)70%extreme
September Weather18°C (64°F)144 mm (5.7 inches)82%extreme
October Weather17°C (62°F)69 mm (2.7 inches)91%extreme
November Weather15°C (59°F)17 mm (0.7 inches)89%very high
December Weather14°C (57°F)4 mm (0.1 inches)88%very high

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