December Weather in Oakland, United States

Last updated: June 24, 2025

In Oakland, United States, the average temperature in December hovers around -1°C (30°F). Temperatures can swing dramatically, dipping to a bone-chilling -23°C (-9°F) at times, while peaking at a comfortable 20°C (69°F). Expect approximately 44 mm (1.7 in) of precipitation spread over 4 days, contributing to an average humidity of 83%.

December Temperature in Oakland

In December in Oakland, the average temperature is -1°C (30°F). Maximum temperatures can reach 20°C (69°F), while minimums can drop as low as -23°C (-9°F). Be prepared for a wide range of temperatures when traveling during this time.

December Weather in Oakland: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Oakland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oakland, December typically has an average temperature of -1°C (30°F), with highs reaching up to 20°C (69°F) and lows dropping to around -23°C (-9°F).

Data source: Temperature data for Oakland generated using information from the Copernicus Climate Change Service.

December Precipitation in Oakland

In Oakland in December, the precipitation amount is 44 mm (1.7 in) over the course of 4 days.

December Precipitation Trends in Oakland

The chart displays monthly precipitation patterns in Oakland, 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 Oakland, December typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 4 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Oakland

In Oakland in December humidity is 83%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that seeps through your layers, making outdoor activities uncomfortable and encouraging travelers to seek shelter indoors.

December Average Humidity in Oakland

This chart illustrates the average monthly humidity levels in Oakland, 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 Oakland is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Oakland

In Oakland in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Oakland, you can visit Hourly UV Index in Oakland.

Maximum UV Index Levels in Oakland for December

The chart shows the monthly maximum UV Index (UVI) for Oakland 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 Oakland typically reaches 2, which falls under the low exposure category.

Data source: Oakland 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 Oakland Compares to Other Months

Weather in Oakland varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Oakland, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Oakland, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (24°F)	30 mm (1.2 inches)	76%	moderate
February Weather	-4°C (24°F)	29 mm (1.2 inches)	80%	moderate
March Weather	4°C (40°F)	92 mm (3.6 inches)	73%	high
April Weather	9°C (49°F)	65 mm (2.6 inches)	74%	very high
May Weather	16°C (62°F)	152 mm (6.0 inches)	78%	very high
June Weather	24°C (75°F)	116 mm (4.6 inches)	82%	very high
July Weather	25°C (77°F)	71 mm (2.8 inches)	83%	very high
August Weather	23°C (74°F)	113 mm (4.4 inches)	80%	very high
September Weather	20°C (69°F)	78 mm (3.1 inches)	75%	very high
October Weather	11°C (52°F)	95 mm (3.7 inches)	75%	high
November Weather	4°C (39°F)	29 mm (1.1 inches)	82%	moderate
December Weather	-1°C (30°F)	44 mm (1.7 inches)	83%	low