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May Weather in San Marcos, Peru

Last updated: August 27, 2025

In San Marcos, Peru, the average temperature in May hovers around 12°C (54°F). You'll experience a range of minimum temperatures of 5°C (41°F), while the maximum can reach up to 22°C (71°F). Prepare for precipitation totalling 103 mm (4.0 in) spread over approximately 19 days, and expect an average humidity of 78%.

May Temperature in San Marcos

In May in San Marcos, the average temperature is 12°C (54°F). Maximums can reach 22°C (71°F), while minimums can drop to as low as 5°C (41°F). This range makes it an ideal time for travelers to enjoy outdoor activities with a comfortable climate.

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 12°C (54°F), with highs reaching up to 22°C (71°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec545554545454535454545555
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 103 mm (4.0 in), spread over 19 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 103 mm (4.0 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec19224533518510348284277194219259
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 78%. With an average temperature of 12°C (54°F), this humidity feels like a damp chill settling in, making travel a bit uncomfortable as the air clings to your skin, leaving you feeling cooler than the thermometer suggests.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%88%85%78%62%44%38%42%58%69%82%
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 an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. 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 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec171819181513141417181616
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 Weather12°C (55°F)192 mm (7.5 inches)83%extreme
February Weather13°C (55°F)245 mm (9.6 inches)81%extreme
March Weather12°C (54°F)335 mm (13.2 inches)88%extreme
April Weather12°C (54°F)185 mm (7.3 inches)85%extreme
May Weather12°C (54°F)103 mm (4.0 inches)78%extreme
June Weather12°C (54°F)48 mm (1.9 inches)62%extreme
July Weather12°C (53°F)28 mm (1.1 inches)44%extreme
August Weather12°C (54°F)42 mm (1.7 inches)38%extreme
September Weather12°C (54°F)77 mm (3.0 inches)42%extreme
October Weather12°C (54°F)194 mm (7.6 inches)58%extreme
November Weather13°C (55°F)219 mm (8.6 inches)69%extreme
December Weather13°C (55°F)259 mm (10.2 inches)82%extreme

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