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December Weather in San Francisco, Philippines

Last updated: August 27, 2025

In San Francisco, Philippines, the average temperature in December reaches a warm 27°C (80°F). Expect minimums of 23°C (75°F) and maximums soaring to 31°C (89°F). However, don't forget your umbrella—precipitation totals around 215 mm (8.4 in) over 20 days, coupled with an average humidity of 86%, creates a remarkably tropical atmosphere!

December Temperature in San Francisco

In December in San Francisco, the average temperature is 27°C (80°F), with maximums reaching 31°C (89°F) and minimums dipping to 23°C (75°F). This pleasant climate makes it an ideal time for exploring and enjoying outdoor activities in 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 27°C (80°F), with highs reaching up to 31°C (89°F) and lows dropping to around 23°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec797981838484838382828180
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 total precipitation amount reaches 215 mm (8.4 in) over the course 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 215 mm (8.4 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec105755147151219313242315252197215
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 86%. With an average temperature of 27°C (80°F), this humidity feels like a warm, sticky blanket enveloping you, making travel feel heavy and exhausting as you navigate the sultry air.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%75%74%76%76%81%84%85%86%82%85%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec111315151314141514131111
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 Weather26°C (79°F)105 mm (4.1 inches)78%extreme
February Weather26°C (79°F)74 mm (2.9 inches)75%extreme
March Weather27°C (81°F)51 mm (2.0 inches)74%extreme
April Weather28°C (83°F)47 mm (1.8 inches)76%extreme
May Weather29°C (84°F)151 mm (6.0 inches)76%extreme
June Weather29°C (84°F)219 mm (8.6 inches)81%extreme
July Weather28°C (83°F)313 mm (12.3 inches)84%extreme
August Weather28°C (83°F)242 mm (9.5 inches)85%extreme
September Weather28°C (83°F)315 mm (12.4 inches)85%extreme
October Weather28°C (82°F)252 mm (9.9 inches)82%extreme
November Weather27°C (82°F)197 mm (7.8 inches)85%extreme
December Weather27°C (80°F)215 mm (8.4 inches)86%extreme

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