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May Weather in San Marcos, Mexico

Last updated: August 27, 2025

In May, the average temperature in San Marcos, Mexico hovers around 29°C (85°F), with minimums dropping to a cool 14°C (58°F) and maximums soaring up to a scorching 42°C (108°F). Despite the heat, precipitation is quite minimal at just 4 mm (0.2 in) over the course of 0 days. The air is relatively comfortable with an average humidity of 52%.

May Temperature in San Marcos

In May in San Marcos, the average temperature is 29°C (85°F). Maximums can reach 42°C (108°F), while minimums can drop as low as 14°C (58°F). Travelers should be prepared for hot days and cooler nights, making it ideal to pack accordingly for both warm and cool temperatures.

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 29°C (85°F), with highs reaching up to 42°C (108°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec596672798586858580756761
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.

May Precipitation in San Marcos

In San Marcos in May, the precipitation amount is 4 mm (0.2 in) over the course of 0 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 4 mm (0.2 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec45924122283325511
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Marcos

In San Marcos in May, humidity is 52%. With average temperature of 29°C (85°F), this humidity feels like a warm, slightly sticky embrace, making travel comfortable yet requiring occasional breaks in the shade to stay refreshed.

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 52%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%62%53%48%52%64%73%71%82%83%82%84%
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 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 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 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec710121313131313131187
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.
 TemperaturePrecipitationHumidityUV
January Weather15°C (60°F)4 mm (0.1 inches)70%high
February Weather19°C (67°F)5 mm (0.2 inches)62%very high
March Weather22°C (73°F)9 mm (0.3 inches)53%extreme
April Weather26°C (79°F)2 mm (0.1 inches)48%extreme
May Weather29°C (85°F)4 mm (0.2 inches)52%extreme
June Weather30°C (86°F)12 mm (0.5 inches)64%extreme
July Weather29°C (85°F)22 mm (0.9 inches)73%extreme
August Weather30°C (85°F)8 mm (0.3 inches)71%extreme
September Weather27°C (81°F)33 mm (1.3 inches)82%extreme
October Weather24°C (76°F)24 mm (1.0 inches)83%extreme
November Weather19°C (67°F)5 mm (0.2 inches)82%very high
December Weather16°C (61°F)11 mm (0.4 inches)84%high

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