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December Weather in San Francisco, Philippines

Last updated: August 27, 2025

In December, the average temperature in San Francisco, Philippines hovers around 27°C (81°F), with a comfortable minimum of 24°C (75°F) and a warm maximum reaching 30°C (86°F). Expect considerable rainfall, averaging 276 mm (10.9 in) over 20 days, and a notably high average humidity of 91%, creating a tropical yet inviting atmosphere.

December Temperature in San Francisco

In December in San Francisco, the average temperature is 27°C (81°F). The maximum can reach 30°C (86°F), and the minimum can be as low as 24°C (75°F). This pleasant weather makes San Francisco an ideal destination for travelers seeking a warm and comfortable climate.

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 (81°F), with highs reaching up to 30°C (86°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec807980818282818281818181
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 276 mm (10.9 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 276 mm (10.9 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec194937367122279288224249288179276
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 91%. With an average temperature of 27°C (81°F), this humidity feels like a warm, thick haze wrapping around you, making travel feel sluggish and the air heavy, damp with the scent of earth and greenery, which can be both enchanting and exhausting.

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 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%80%77%78%85%87%88%89%90%87%90%91%
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.
JanFebMarAprMayJunJulAugSepOctNovDec121416161413131414131211
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 (80°F)194 mm (7.6 inches)85%extreme
February Weather26°C (80°F)93 mm (3.6 inches)80%extreme
March Weather27°C (80°F)73 mm (2.9 inches)77%extreme
April Weather27°C (81°F)67 mm (2.6 inches)78%extreme
May Weather28°C (82°F)122 mm (4.8 inches)84%extreme
June Weather28°C (82°F)279 mm (11.0 inches)87%extreme
July Weather27°C (82°F)288 mm (11.3 inches)88%extreme
August Weather28°C (82°F)224 mm (8.8 inches)89%extreme
September Weather27°C (82°F)249 mm (9.8 inches)90%extreme
October Weather27°C (81°F)288 mm (11.3 inches)87%extreme
November Weather27°C (82°F)179 mm (7.0 inches)90%extreme
December Weather27°C (81°F)276 mm (10.9 inches)91%extreme

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