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December Weather in San Francisco, Mexico

Last updated: August 27, 2025

In December, the average temperature in San Francisco, Mexico hovers around 16°C (62°F). Visitors can expect a minimum chill of 3°C (38°F) and can enjoy warm highs reaching 31°C (88°F). The region experiences 12 mm (0.5 in) of precipitation over the course of just 1 day, while the average humidity sits at a comfortable 72%.

December Temperature in San Francisco

In December in San Francisco, the average temperature is 16°C (62°F). The maximum can reach 31°C (88°F), and the minimum can be as low as 3°C (38°F). Pack accordingly to enjoy the pleasant days while being prepared for cooler evenings!

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

The chart illustrates December 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, December typically has an average temperature of 16°C (62°F), with highs reaching up to 31°C (88°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec616163666771788179746861
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.

December Precipitation in San Francisco

In San Francisco in December, the precipitation amount is 12 mm (0.5 in) over the course of 1 day.

December Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In San Francisco, December typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec121014111221191512
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Francisco

In San Francisco in December, humidity is 72%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapped around you, making it slightly uncomfortable for traveling as you might find yourself sweating more than usual, especially during outdoor activities.

December Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in San Francisco is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%69%61%58%61%61%63%70%75%72%72%72%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Francisco

In San Francisco in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in San Francisco.

Maximum UV Index Levels in San Francisco for December

The chart shows the monthly maximum UV Index (UVI) for San Francisco in December, 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 December, the maximum UV index in San Francisco typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810121212121212975
Data source: San Francisco December 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 December 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 December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (61°F)12 mm (0.5 inches)71%high
February Weather16°C (62°F)10 mm (0.4 inches)69%very high
March Weather17°C (64°F)14 mm (0.6 inches)61%very high
April Weather19°C (67°F)1 mm (0.0 inches)58%extreme
May Weather19°C (67°F)1 mm (0.0 inches)61%extreme
June Weather22°C (72°F)1 mm (0.0 inches)61%extreme
July Weather26°C (79°F)2 mm (0.1 inches)63%extreme
August Weather27°C (81°F)2 mm (0.1 inches)70%extreme
September Weather26°C (79°F)11 mm (0.4 inches)75%extreme
October Weather23°C (74°F)9 mm (0.4 inches)71%very high
November Weather20°C (68°F)15 mm (0.6 inches)72%high
December Weather16°C (62°F)12 mm (0.5 inches)72%moderate

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