January Weather in San Francisco, Mexico

Last updated: August 27, 2025

In January, the average temperature in San Francisco, Mexico hovers around 16°C (61°F), offering a pleasant climate. The weather can be quite variable, with temperatures ranging from a cool 4°C (40°F) to a warm 33°C (92°F). Expect around 12 mm (0.5 in) of precipitation over the course of just 1 day, while the average humidity sits at a comfortable 71%.

January Temperature in San Francisco

In January in San Francisco, the average temperature is 16°C (61°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as 4°C (40°F). Be prepared for a wide range of temperatures when traveling during this month.

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 33°C (92°F) and lows dropping to around 4°C (40°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 precipitation amount is 12 mm (0.5 in) over the course of 1 day.

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 12 mm (0.5 inches) of precipitation spread over approximately 1 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in San Francisco

In San Francisco in January humidity is 71%. With an average temperature of 16°C (61°F), this humidity feels like walking through a warm, damp blanket, making travel slightly uncomfortable but still enjoyable for those who appreciate mild weather.

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 71%, 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 is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in San Francisco, you can refer to this 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 6, which falls under the high 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)	12 mm (0.5 inches)	71%	high
February Weather	16°C (62°F)	10 mm (0.4 inches)	69%	very high
March Weather	17°C (64°F)	14 mm (0.6 inches)	61%	very high
April Weather	19°C (67°F)	1 mm (0.0 inches)	58%	extreme
May Weather	19°C (67°F)	1 mm (0.0 inches)	61%	extreme
June Weather	22°C (72°F)	1 mm (0.0 inches)	61%	extreme
July Weather	26°C (79°F)	2 mm (0.1 inches)	63%	extreme
August Weather	27°C (81°F)	2 mm (0.1 inches)	70%	extreme
September Weather	26°C (79°F)	11 mm (0.4 inches)	75%	extreme
October Weather	23°C (74°F)	9 mm (0.4 inches)	71%	very high
November Weather	20°C (68°F)	15 mm (0.6 inches)	72%	high
December Weather	16°C (62°F)	12 mm (0.5 inches)	72%	moderate