October Weather in San Francisco, Peru

Last updated: August 27, 2025

In October, the average temperature in San Francisco, Peru is a pleasant 18°C (65°F), with lows dipping to 14°C (57°F) and highs reaching up to 23°C (74°F). Expect a modest precipitation of 5 mm (0.2 in) over about 1 day, and enjoy an average humidity level of 68%. Perfect weather to explore!

October Temperature in San Francisco

In October in San Francisco, the average temperature is 18°C (65°F). Maximum temperatures can reach 23°C (74°F), while minimums can drop as low as 14°C (57°F). This mild weather makes San Francisco a perfect destination for outdoor activities and exploring.

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

The chart illustrates October temperature patterns in San Francisco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Francisco, October typically has an average temperature of 18°C (65°F), with highs reaching up to 23°C (74°F) and lows dropping to around 14°C (57°F).

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

October Precipitation in San Francisco

In San Francisco in October, the precipitation amount is 5 mm (0.2 in) over a duration of 1 day.

October Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, 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 Francisco, October typically receives around 5 mm (0.2 inches) of precipitation spread over approximately 1 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in San Francisco

In San Francisco in October, humidity is 68%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel somewhat sticky and requiring occasional breaks for refreshing hydration.

October Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, 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 Francisco is approximately 68%, 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 Francisco

In San Francisco in October, 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 Francisco.

Maximum UV Index Levels in San Francisco for October

The chart shows the monthly maximum UV Index (UVI) for San Francisco 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 Francisco typically reaches 15, which falls under the extreme exposure category.

Data source: San Francisco 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 Francisco Compares to Other Months

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

This table compares monthly weather conditions in San Francisco, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	20°C (69°F)	73 mm (2.9 inches)	89%	extreme
February Weather	21°C (69°F)	84 mm (3.3 inches)	89%	extreme
March Weather	21°C (70°F)	58 mm (2.3 inches)	90%	extreme
April Weather	20°C (68°F)	20 mm (0.8 inches)	89%	extreme
May Weather	19°C (66°F)	4 mm (0.2 inches)	83%	extreme
June Weather	18°C (65°F)	1 mm (0.1 inches)	69%	very high
July Weather	18°C (64°F)	1 mm (0.0 inches)	56%	extreme
August Weather	18°C (64°F)	0 mm (0.0 inches)	50%	extreme
September Weather	18°C (64°F)	2 mm (0.1 inches)	53%	extreme
October Weather	18°C (65°F)	5 mm (0.2 inches)	68%	extreme
November Weather	19°C (66°F)	5 mm (0.2 inches)	81%	extreme
December Weather	19°C (67°F)	13 mm (0.5 inches)	87%	extreme