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May Weather in San Marcos, Peru

Last updated: August 27, 2025

In May, the average temperature in San Marcos, Peru hovers around 5°C (41°F), with the thermometers dipping as low as -4°C (26°F) and peaking at 14°C (58°F). Expect 101 mm (4.0 in) of precipitation over 24 days, contributing to an average humidity of 86%. Be prepared for a chilly and damp month!

May Temperature in San Marcos

In May in San Marcos, the average temperature is 5°C (41°F), with maximums reaching up to 14°C (58°F) and minimums dropping as low as -4°C (26°F). Travelers should prepare for chilly weather and pack accordingly to fully enjoy their time in San Marcos.

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 5°C (41°F), with highs reaching up to 14°C (58°F) and lows dropping to around -4°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec414241414140393940414242
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 101 mm (4.0 in) over a span of 24 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 101 mm (4.0 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec209224272159101514155114179194232
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 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%86%89%89%86%71%44%34%37%50%73%91%
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 is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to 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 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec212021191613151519191819
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 Weather5°C (42°F)209 mm (8.2 inches)88%extreme
February Weather6°C (42°F)224 mm (8.8 inches)86%extreme
March Weather5°C (42°F)272 mm (10.7 inches)89%extreme
April Weather5°C (42°F)159 mm (6.2 inches)89%extreme
May Weather5°C (41°F)101 mm (4.0 inches)86%extreme
June Weather5°C (41°F)51 mm (2.0 inches)71%extreme
July Weather4°C (39°F)41 mm (1.6 inches)44%extreme
August Weather4°C (40°F)55 mm (2.2 inches)34%extreme
September Weather4°C (40°F)114 mm (4.5 inches)37%extreme
October Weather5°C (41°F)179 mm (7.0 inches)50%extreme
November Weather6°C (42°F)194 mm (7.6 inches)73%extreme
December Weather6°C (42°F)232 mm (9.1 inches)91%extreme

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