January Weather in San Francisco, Peru

Last updated: August 27, 2025

In January, the average temperature in San Francisco, Peru hovers around 16°C (61°F), with lows dipping to a pleasant 10°C (50°F) and highs reaching a comfortable 26°C (79°F). Expect 408 mm (16.0 in) of precipitation spread over 24 days, accompanied by a high average humidity of 93%, creating a lush and vibrant atmosphere throughout the month.

January Temperature in San Francisco

In January in San Francisco, the average temperature is 16°C (61°F). Maximum temperatures can reach 26°C (79°F), while minimums can dip as low as 10°C (50°F). This climate makes San Francisco a comfortable destination for outdoor activities and exploration.

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

The chart illustrates January 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, January typically has an average temperature of 16°C (61°F), with highs reaching up to 26°C (79°F) and lows dropping to around 10°C (50°F).

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

January Precipitation in San Francisco

In San Francisco in January, the total precipitation amount is 408 mm (16.0 in), which occurs over the course of 24 days.

January Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In San Francisco, January typically receives around 408 mm (16.0 inches) of precipitation spread over approximately 24 days.

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

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Millimeters (mm) Inches (in)

January Humidity in San Francisco

In San Francisco in January humidity is 93%. With an average temperature of 16°C (61°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities feel stifling and potentially exhausting, which can dampen the joy of traveling.

January Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in San Francisco is approximately 93%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in San Francisco

In San Francisco in January, the maximum UV index reaches an alarming 17, which falls under the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to stay protected. For more details on the hourly UV index in San Francisco, you can check Hourly UV Index in San Francisco.

Maximum UV Index Levels in San Francisco for January

The chart shows the monthly maximum UV Index (UVI) for San Francisco in January, 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 January, the maximum UV index in San Francisco typically reaches 17, which falls under the extreme exposure category.

Data source: San Francisco January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	16°C (61°F)	408 mm (16.0 inches)	93%	extreme
February Weather	16°C (61°F)	401 mm (15.8 inches)	92%	extreme
March Weather	16°C (61°F)	465 mm (18.3 inches)	92%	extreme
April Weather	16°C (61°F)	282 mm (11.1 inches)	90%	extreme
May Weather	15°C (60°F)	105 mm (4.1 inches)	85%	extreme
June Weather	15°C (59°F)	40 mm (1.6 inches)	70%	extreme
July Weather	14°C (58°F)	27 mm (1.1 inches)	54%	extreme
August Weather	15°C (58°F)	64 mm (2.5 inches)	44%	extreme
September Weather	15°C (60°F)	189 mm (7.5 inches)	52%	extreme
October Weather	16°C (61°F)	299 mm (11.8 inches)	65%	extreme
November Weather	16°C (62°F)	325 mm (12.8 inches)	81%	extreme
December Weather	16°C (62°F)	325 mm (12.8 inches)	89%	extreme