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May Weather in San Isidro, Peru

Last updated: August 27, 2025

In May, the average temperature in San Isidro, Peru reaches a balmy 26°C (78°F). Expect a comfortable minimum of 20°C (68°F) and a warm maximum of 33°C (92°F). However, prepare for a considerable precipitation of 245 mm (9.7 in) spread across 27 days, and keep in mind the average humidity hovers around a sticky 91%.

May Temperature in San Isidro

In May in San Isidro, the average temperature is 26°C (78°F). The maximum can reach 33°C (92°F), while the minimum can be as low as 20°C (68°F). This mild and pleasant climate makes San Isidro an ideal destination for travelers looking to enjoy warm weather and outdoor activities.

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

The chart illustrates May temperature patterns in San Isidro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Isidro, May typically has an average temperature of 26°C (78°F), with highs reaching up to 33°C (92°F) and lows dropping to around 20°C (68°F).
JanFebMarAprMayJunJulAugSepOctNovDec787978787878777879797978
Data source: Temperature data for San Isidro 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 Isidro

In San Isidro in May, the total precipitation amount is 245 mm (9.7 in) spread over 27 days.

May Precipitation Trends in San Isidro

The chart displays monthly precipitation patterns in San Isidro, 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 Isidro, May typically receives around 245 mm (9.7 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec275284329323245186159121176211245322
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Isidro

In San Isidro in May humidity is 91%. With an average temperature of 26°C (78°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities challenging and perspiration inevitable, creating a heavy atmosphere that may lead travelers to seek shade and refreshing drinks more frequently.

May Average Humidity in San Isidro

This chart illustrates the average monthly humidity levels in San Isidro, 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 Isidro is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%82%85%91%85%74%59%55%57%74%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Isidro

In San Isidro 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 Isidro.

Maximum UV Index Levels in San Isidro for May

The chart shows the monthly maximum UV Index (UVI) for San Isidro 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 Isidro typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151617161312111214141313
Data source: San Isidro 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 Isidro Compares to Other Months

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

This table compares monthly weather conditions in San Isidro, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (78°F)275 mm (10.8 inches)83%extreme
February Weather26°C (79°F)284 mm (11.2 inches)78%extreme
March Weather26°C (79°F)329 mm (13.0 inches)82%extreme
April Weather26°C (79°F)323 mm (12.7 inches)85%extreme
May Weather26°C (78°F)245 mm (9.7 inches)91%extreme
June Weather25°C (78°F)186 mm (7.3 inches)85%extreme
July Weather25°C (77°F)159 mm (6.3 inches)74%extreme
August Weather26°C (78°F)121 mm (4.8 inches)59%extreme
September Weather26°C (79°F)175 mm (6.9 inches)55%extreme
October Weather26°C (79°F)211 mm (8.3 inches)57%extreme
November Weather26°C (79°F)245 mm (9.6 inches)74%extreme
December Weather26°C (79°F)322 mm (12.7 inches)87%extreme

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