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October Weather in San Juan, Peru

Last updated: August 27, 2025

In San Juan, Peru, the average temperature in October is a brisk 13°C (55°F), with temperatures dipping as low as 5°C (42°F) and peaking at 18°C (65°F). Expect a total precipitation of 99 mm (3.9 in) spread over 24 days, contributing to the area's average humidity of 68%. Whether you're bracing for chilly breezes or the possibility of rain, it's wise to prepare for a varied climate this month!

October Temperature in San Juan

In October in San Juan, the average temperature is 13°C (55°F). Maximum temperatures can reach 18°C (65°F), while minimums can drop as low as 5°C (42°F). Be sure to pack layers to stay comfortable while exploring the varied weather conditions!

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

The chart illustrates October 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, October typically has an average temperature of 13°C (55°F), with highs reaching up to 18°C (65°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec545555555454555555555555
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.

October Precipitation in San Juan

In San Juan in October, the precipitation amount is 99 mm (3.9 in) spread over a period of 24 days.

October Precipitation Trends in San Juan

The chart displays monthly precipitation patterns in San Juan, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In San Juan, October typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec22924424612560231926729976129
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in San Juan

In San Juan in October humidity is 68%. With an average temperature of 13°C (55°F), this humidity feels like a cool, damp embrace, making outdoor exploration refreshing yet slightly chilly, and travelers should be prepared for a sweater to enjoy their adventures comfortably.

October Average Humidity in San Juan

This chart illustrates the average monthly humidity levels in San Juan, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in San Juan is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%90%89%83%69%56%51%53%68%82%87%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in San Juan

In San Juan in October, the maximum UV index is 18, which corresponds to an extreme exposure category. This means that the time to burn is just 10 minutes. For more detailed information, you can check the hourly UV index in San Juan.

Maximum UV Index Levels in San Juan for October

The chart shows the monthly maximum UV Index (UVI) for San Juan in October, 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 October, the maximum UV index in San Juan typically reaches 18, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec181918171411131416181818
Data source: San Juan October 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 October 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 October’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 October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (55°F)229 mm (9.0 inches)89%extreme
February Weather13°C (55°F)244 mm (9.6 inches)89%extreme
March Weather13°C (55°F)246 mm (9.7 inches)90%extreme
April Weather13°C (55°F)125 mm (4.9 inches)89%extreme
May Weather12°C (55°F)60 mm (2.3 inches)83%extreme
June Weather12°C (55°F)23 mm (0.9 inches)69%extreme
July Weather13°C (55°F)19 mm (0.7 inches)56%extreme
August Weather13°C (55°F)26 mm (1.0 inches)50%extreme
September Weather13°C (56°F)72 mm (2.9 inches)53%extreme
October Weather13°C (55°F)99 mm (3.9 inches)68%extreme
November Weather13°C (56°F)76 mm (3.0 inches)81%extreme
December Weather13°C (55°F)129 mm (5.1 inches)87%extreme

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