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January Weather in San Francisco, Mexico

Last updated: August 26, 2025

In San Francisco, Mexico, the average temperature in January reaches a pleasant 23°C (74°F). During this time, temperatures can dip to a minimum of 12°C (54°F) and soar to a maximum of 35°C (95°F). Expect a modest 8 mm (0.3 in) of precipitation over about 3 days, complemented by an average humidity of 65%. Enjoy the mild climate while exploring!

January Temperature in San Francisco

In January in San Francisco, the average temperature is 23°C (74°F). The maximum can reach 35°C (95°F), and the minimum can be as low as 12°C (54°F). This makes San Francisco an ideal destination for travelers looking for warm weather with a comfortable range of temperatures.

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 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec747578798077777675757573
Data source: Temperature data for San Francisco 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.

January Precipitation in San Francisco

In San Francisco in January, the precipitation amount is 8 mm (0.3 in) over the course of 3 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 8 mm (0.3 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec8333653683654785304749534
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in San Francisco

In San Francisco in January, humidity is 65%. With an average temperature of 23°C (74°F), this humidity feels like a warm, sticky embrace, making outdoor activities somewhat challenging but still enjoyable with the right planning.

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 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec65%61%59%62%73%78%79%82%82%79%72%70%
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 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121414141414131412109
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.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)8 mm (0.3 inches)65%very high
February Weather24°C (75°F)3 mm (0.1 inches)61%extreme
March Weather25°C (78°F)3 mm (0.1 inches)59%extreme
April Weather26°C (80°F)3 mm (0.1 inches)62%extreme
May Weather27°C (80°F)65 mm (2.6 inches)73%extreme
June Weather25°C (77°F)368 mm (14.5 inches)78%extreme
July Weather25°C (77°F)365 mm (14.4 inches)79%extreme
August Weather24°C (76°F)478 mm (18.8 inches)82%extreme
September Weather24°C (76°F)530 mm (20.9 inches)82%extreme
October Weather24°C (76°F)474 mm (18.7 inches)79%extreme
November Weather24°C (75°F)95 mm (3.7 inches)72%very high
December Weather23°C (73°F)34 mm (1.3 inches)70%very high

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