October Weather in San Juan, Peru

Last updated: August 27, 2025

In October, the average temperature in San Juan, Peru hovers around 12°C (54°F), making it a pleasantly mild time of year. Expect minimums dipping to 4°C (40°F) and highs reaching up to 21°C (71°F). However, with 299 mm (11.8 in) of precipitation spread over 26 days, it's wise to pack an umbrella! The average humidity sits at a comfortable 58%, adding to the region's charm.

October Temperature in San Juan

In October in San Juan, the average temperature is 12°C (54°F). The maximum can reach 21°C (71°F) and the minimum can be as low as 4°C (40°F). This mild weather makes it a great time for travelers to explore and enjoy outdoor activities in San Juan.

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 12°C (54°F), with highs reaching up to 21°C (71°F) and lows dropping to around 4°C (40°F).

Data source: Temperature data for San Juan generated using information from the Copernicus Climate Change Service.

October Precipitation in San Juan

In San Juan in October, the total precipitation amount is 299 mm (11.8 in) spread over 26 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 299 mm (11.8 inches) of precipitation spread over approximately 26 days.

Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

October Humidity in San Juan

In San Juan in October, humidity is 58%. With an average temperature of 12°C (54°F), this humidity feels like a cool, brisk morning, making it perfect for travelers who enjoy exploring the outdoors without feeling overheated.

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 58%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	304 mm (12.0 inches)	83%	extreme
February Weather	12°C (54°F)	392 mm (15.4 inches)	81%	extreme
March Weather	12°C (53°F)	599 mm (23.6 inches)	88%	extreme
April Weather	12°C (54°F)	348 mm (13.7 inches)	85%	extreme
May Weather	12°C (54°F)	188 mm (7.4 inches)	78%	extreme
June Weather	12°C (54°F)	70 mm (2.8 inches)	62%	extreme
July Weather	12°C (54°F)	43 mm (1.7 inches)	44%	extreme
August Weather	12°C (55°F)	47 mm (1.9 inches)	38%	extreme
September Weather	12°C (54°F)	154 mm (6.1 inches)	42%	extreme
October Weather	12°C (54°F)	299 mm (11.8 inches)	58%	extreme
November Weather	12°C (54°F)	290 mm (11.4 inches)	69%	extreme
December Weather	12°C (54°F)	413 mm (16.2 inches)	82%	extreme