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August Weather in San Marcos, Mexico

Last updated: August 27, 2025

In August, the average temperature in San Marcos, Mexico hovers around 28°C (83°F), with minimums dipping to 23°C (73°F) and maximums soaring to 37°C (99°F). Expect considerable precipitation, totaling 262 mm (10.3 in) over 22 days, along with a high average humidity of 82%. Get ready for a warm and wet climate!

August Temperature in San Marcos

In August in San Marcos, the average temperature is 28°C (83°F). The maximum can reach 37°C (99°F), while the minimum can be as low as 23°C (73°F). This warm climate makes it an ideal destination for beach lovers and those seeking sunshine.

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

The chart illustrates August 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, August typically has an average temperature of 28°C (83°F), with highs reaching up to 37°C (99°F) and lows dropping to around 23°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec808082828482838281818180
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.

August Precipitation in San Marcos

In San Marcos in August, the precipitation amount is 262 mm (10.3 in) during 22 days, indicating a significant level of moisture within that period.

August Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In San Marcos, August typically receives around 262 mm (10.3 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec2102132371052623032284319
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in San Marcos

In San Marcos in August, humidity is 82%. With an average temperature of 28°C (83°F), this humidity feels like stepping into a warm, damp embrace, which can make traveling feel heavy and exhausting, as every movement can be met with a sticky veil of moisture that clings to the skin.

August Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in San Marcos is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec65%61%59%62%73%78%79%82%82%79%72%70%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Marcos

In San Marcos in August, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in San Marcos.

Maximum UV Index Levels in San Marcos for August

The chart shows the monthly maximum UV Index (UVI) for San Marcos in August, 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 August, the maximum UV index in San Marcos typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131313141313131198
Data source: San Marcos August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (80°F)2 mm (0.1 inches)65%very high
February Weather27°C (81°F)1 mm (0.0 inches)61%extreme
March Weather28°C (82°F)0 mm (0.0 inches)59%extreme
April Weather28°C (83°F)1 mm (0.1 inches)62%extreme
May Weather29°C (84°F)13 mm (0.5 inches)73%extreme
June Weather28°C (82°F)237 mm (9.3 inches)78%extreme
July Weather29°C (84°F)105 mm (4.1 inches)79%extreme
August Weather28°C (83°F)262 mm (10.3 inches)82%extreme
September Weather27°C (81°F)303 mm (11.9 inches)82%extreme
October Weather27°C (81°F)228 mm (9.0 inches)79%extreme
November Weather27°C (81°F)43 mm (1.7 inches)72%very high
December Weather27°C (80°F)19 mm (0.8 inches)70%very high

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