December Weather in Pleasanton, United States

Last updated: June 24, 2025

In December, the average temperature in Pleasanton, United States hovers around 14°C (58°F). However, be prepared for a range, as it can dip to a chilly -3°C (26°F) or soar up to a warm 32°C (89°F). Expect 43 mm (1.7 in) of precipitation over approximately 5 days, contributing to an average humidity of 86%.

December Temperature in Pleasanton

In December in Pleasanton, the average temperature is 14°C (58°F), with maximums reaching 32°C (89°F) and minimums dropping as low as -3°C (26°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack accordingly for both warm and cool conditions.

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

The chart illustrates December temperature patterns in Pleasanton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pleasanton, December typically has an average temperature of 14°C (58°F), with highs reaching up to 32°C (89°F) and lows dropping to around -3°C (26°F).

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

December Precipitation in Pleasanton

In Pleasanton in December, the precipitation amount is 43 mm (1.7 in) over the course of 5 days.

December Precipitation Trends in Pleasanton

The chart displays monthly precipitation patterns in Pleasanton, 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 Pleasanton, December typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 5 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 Pleasanton

In Pleasanton in December, humidity is 86%. With an average temperature of 14°C (58°F), this humidity feels like traveling in a warm, sticky embrace that can make outdoor adventures a bit heavy and sweat-inducing, so it's wise to stay hydrated and take frequent breaks in the shade.

December Average Humidity in Pleasanton

This chart illustrates the average monthly humidity levels in Pleasanton, 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 Pleasanton is approximately 86%, 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 Pleasanton

In Pleasanton in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Pleasanton.

Maximum UV Index Levels in Pleasanton for December

The chart shows the monthly maximum UV Index (UVI) for Pleasanton 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 Pleasanton typically reaches 5, which falls under the moderate exposure category.

Data source: Pleasanton 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 Pleasanton Compares to Other Months

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

This table compares monthly weather conditions in Pleasanton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (55°F)	32 mm (1.3 inches)	79%	moderate
February Weather	14°C (58°F)	46 mm (1.8 inches)	79%	very high
March Weather	20°C (67°F)	53 mm (2.1 inches)	74%	very high
April Weather	22°C (73°F)	52 mm (2.0 inches)	76%	extreme
May Weather	26°C (80°F)	103 mm (4.1 inches)	81%	extreme
June Weather	29°C (85°F)	64 mm (2.5 inches)	76%	extreme
July Weather	30°C (87°F)	72 mm (2.8 inches)	66%	extreme
August Weather	31°C (88°F)	52 mm (2.1 inches)	58%	extreme
September Weather	28°C (82°F)	108 mm (4.3 inches)	65%	extreme
October Weather	23°C (74°F)	76 mm (3.0 inches)	74%	very high
November Weather	17°C (64°F)	43 mm (1.7 inches)	81%	high
December Weather	14°C (58°F)	43 mm (1.7 inches)	86%	moderate