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December Weather in San Francisco, Colombia

Last updated: August 23, 2025

In December, the average temperature in San Francisco, Colombia is a comfortable 16°C (61°F), with lows dipping to a brisk 8°C (47°F) and highs reaching a pleasant 23°C (73°F). Expect around 165 mm (6.5 in) of precipitation over 24 days, contributing to an average humidity of 66% that keeps the air feeling fresh.

December Temperature in San Francisco

In December in San Francisco, the average temperature is 16°C (61°F). Maximums can reach 23°C (73°F), while minimums can be as low as 8°C (47°F). This mild climate makes San Francisco an ideal destination for travelers seeking pleasant weather and outdoor activities.

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 (61°F), with highs reaching up to 23°C (73°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec616161626262636362616161
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 165 mm (6.5 in) spread over 24 days.

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 165 mm (6.5 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec122240345308307184128123198304257165
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 66%. With an average temperature of 16°C (61°F), this humidity feels like a heavy blanket enveloping you, making travel somewhat uncomfortable as the air grows sticky and tedious, slightly sapping your energy as you explore.

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 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec51%46%50%64%85%92%89%73%64%68%73%66%
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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec131416161514131414141211
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)122 mm (4.8 inches)51%extreme
February Weather16°C (61°F)240 mm (9.5 inches)46%extreme
March Weather16°C (61°F)345 mm (13.6 inches)49%extreme
April Weather16°C (62°F)308 mm (12.1 inches)63%extreme
May Weather17°C (62°F)307 mm (12.1 inches)85%extreme
June Weather17°C (62°F)184 mm (7.2 inches)92%extreme
July Weather17°C (63°F)128 mm (5.0 inches)89%extreme
August Weather17°C (63°F)123 mm (4.8 inches)73%extreme
September Weather17°C (62°F)198 mm (7.8 inches)64%extreme
October Weather16°C (61°F)304 mm (12.0 inches)67%extreme
November Weather16°C (61°F)257 mm (10.1 inches)73%extreme
December Weather16°C (61°F)165 mm (6.5 inches)66%extreme

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