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December Weather in San Francisco, Colombia

Last updated: August 23, 2025

In San Francisco, Colombia, the average temperature in December hovers around 23°C (73°F), making it a pleasant time to explore. However, expect a range between a cool 16°C (61°F) and a warm 31°C (88°F). With 146 mm (5.7 in) of precipitation spread over 20 days, be prepared for some rain. Notably, the average humidity sits at a high 83%, adding to the overall tropical feel of the month.

December Temperature in San Francisco

In December in San Francisco, the average temperature is 23°C (73°F), with maximums reaching 31°C (88°F) and minimums dropping to as low as 16°C (61°F). It's a perfect time for travelers to enjoy mild weather and outdoor activities while exploring the beauty of San Francisco.

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 23°C (73°F), with highs reaching up to 31°C (88°F) and lows dropping to around 16°C (61°F).
JanFebMarAprMayJunJulAugSepOctNovDec727473737474757574737273
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 146 mm (5.7 in) spread over a duration of 20 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 146 mm (5.7 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec1061012382522511035594147279425146
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 83%. With an average temperature of 23°C (73°F), this humidity feels like a heavy blanket wrapping around you, making travel slightly uncomfortable and causing you to break a sweat 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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%77%80%83%88%87%85%80%80%85%87%83%
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 is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, 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 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141516171514141514141312
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 Weather22°C (73°F)105 mm (4.2 inches)78%extreme
February Weather23°C (74°F)101 mm (4.0 inches)77%extreme
March Weather23°C (74°F)238 mm (9.4 inches)80%extreme
April Weather23°C (74°F)252 mm (9.9 inches)83%extreme
May Weather23°C (74°F)251 mm (9.9 inches)87%extreme
June Weather23°C (74°F)103 mm (4.1 inches)87%extreme
July Weather24°C (76°F)55 mm (2.2 inches)85%extreme
August Weather24°C (76°F)94 mm (3.7 inches)80%extreme
September Weather23°C (75°F)147 mm (5.8 inches)80%extreme
October Weather23°C (73°F)279 mm (11.0 inches)85%extreme
November Weather22°C (72°F)425 mm (16.7 inches)87%extreme
December Weather23°C (73°F)146 mm (5.7 inches)83%extreme

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