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May Weather in San Luis, Peru

Last updated: August 27, 2025

In May, the average temperature in San Luis, Peru hovers around 9°C (48°F), providing a cool atmosphere. Expect lows of 1°C (34°F) and highs reaching 18°C (64°F). With an average humidity of 86%, it's advisable to dress in layers. Be prepared for some precipitation as well; throughout the month, anticipate 87 mm (3.4 in) of rain spread over 21 days. Enjoy the refreshing ambiance!

May Temperature in San Luis

In May in San Luis, the average temperature is 9°C (48°F). Maximums can reach 18°C (64°F) and minimums can be as low as 1°C (34°F). Be prepared for cool weather and pack accordingly for a pleasant trip!

May Weather in San Luis: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Luis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Luis, May typically has an average temperature of 9°C (48°F), with highs reaching up to 18°C (64°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec484948484847464647484949
Data source: Temperature data for San Luis 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 Luis

In San Luis in May, the precipitation amount is 87 mm (3.4 in) over a span of 21 days.

May Precipitation Trends in San Luis

The chart displays monthly precipitation patterns in San Luis, 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 Luis, May typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec2402232711608745364397179222250
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Luis

In San Luis in May, humidity is 86%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that wraps around you, making outdoor activities uncomfortable and travel less enjoyable.

May Average Humidity in San Luis

This chart illustrates the average monthly humidity levels in San Luis, 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 Luis 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 Luis

In San Luis 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 Luis.

Maximum UV Index Levels in San Luis for May

The chart shows the monthly maximum UV Index (UVI) for San Luis 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 Luis typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec181919181513141417181717
Data source: San Luis 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 Luis Compares to Other Months

Weather in San Luis varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Luis, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Luis, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)240 mm (9.4 inches)88%extreme
February Weather9°C (49°F)223 mm (8.8 inches)86%extreme
March Weather9°C (48°F)271 mm (10.7 inches)89%extreme
April Weather9°C (48°F)160 mm (6.3 inches)89%extreme
May Weather9°C (48°F)87 mm (3.4 inches)86%extreme
June Weather8°C (47°F)45 mm (1.8 inches)71%extreme
July Weather8°C (46°F)36 mm (1.4 inches)44%extreme
August Weather8°C (47°F)43 mm (1.7 inches)34%extreme
September Weather8°C (47°F)97 mm (3.8 inches)37%extreme
October Weather9°C (48°F)179 mm (7.1 inches)50%extreme
November Weather9°C (49°F)222 mm (8.7 inches)73%extreme
December Weather9°C (49°F)250 mm (9.9 inches)91%extreme

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