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August Weather in San Juan, Peru

Last updated: August 27, 2025

In August, the average temperature in San Juan, Peru hovers around 6°C (44°F). Expect chilly nights with a minimum plunge to -8°C (18°F), while daytime can warm up to a maximum of 19°C (67°F). During this month, anticipate 35 mm (1.4 in) of precipitation spread across 8 days, accompanied by an average humidity level of 47%.

August Temperature in San Juan

In August in San Juan, the average temperature is 6°C (44°F). Maximums can reach 19°C (67°F), while minimums can drop as low as -8°C (18°F). Be prepared for a mix of chilly days and mild weather if you're planning to travel during this time.

August Weather in San Juan: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in San Juan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Juan, August typically has an average temperature of 6°C (44°F), with highs reaching up to 19°C (67°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec474747454443424345464647
Data source: Temperature data for San Juan 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.

August Precipitation in San Juan

In San Juan in August, the precipitation amount is 35 mm (1.4 in) over the course of 8 days.

August Precipitation Trends in San Juan

The chart displays monthly precipitation patterns in San Juan, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In San Juan, August typically receives around 35 mm (1.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec254268323142724941369310683146
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in San Juan

In San Juan in August, humidity is 47%. With an average temperature of 6°C (44°F), this humidity feels like a refreshing chill in the air, making it an invigorating experience for traveling, though visitors should be prepared for occasional dampness that can accentuate the coolness.

August Average Humidity in San Juan

This chart illustrates the average monthly humidity levels in San Juan, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in San Juan is approximately 47%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%90%90%84%67%53%47%53%67%75%83%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Juan

In San Juan in August, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Juan, you can check here.

Maximum UV Index Levels in San Juan for August

The chart shows the monthly maximum UV Index (UVI) for San Juan in August, 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 August, the maximum UV index in San Juan typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec181818161311121416171818
Data source: San Juan August 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 August Weather in San Juan Compares to Other Months

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

This table compares monthly weather conditions in San Juan, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)254 mm (10.0 inches)89%extreme
February Weather8°C (47°F)268 mm (10.6 inches)90%extreme
March Weather8°C (47°F)323 mm (12.7 inches)90%extreme
April Weather7°C (46°F)142 mm (5.6 inches)90%extreme
May Weather6°C (44°F)72 mm (2.8 inches)84%extreme
June Weather6°C (43°F)49 mm (1.9 inches)67%extreme
July Weather6°C (43°F)41 mm (1.6 inches)53%extreme
August Weather6°C (44°F)35 mm (1.4 inches)47%extreme
September Weather7°C (46°F)93 mm (3.7 inches)53%extreme
October Weather8°C (46°F)106 mm (4.2 inches)67%extreme
November Weather8°C (47°F)83 mm (3.3 inches)75%extreme
December Weather8°C (47°F)146 mm (5.7 inches)82%extreme

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