December Weather in Irvine, United States

Last updated: June 24, 2025

In December, the average temperature in Irvine, United States hovers around 13°C (56°F), making it a pleasant time to explore. Expect temperatures to range from a cool 4°C (39°F) to a warm 28°C (82°F). During this month, you may encounter 74 mm (2.9 in) of precipitation spread over about 5 days, contributing to an average humidity of 71%. Be prepared for a mix of sunshine and occasional showers!

December Temperature in Irvine

In December in Irvine, the average temperature is 13°C (56°F). The maximum can reach 28°C (82°F), while the minimum can drop as low as 4°C (39°F). This makes Irvine an ideal destination for travelers seeking mild weather with a pleasant range of temperatures.

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

The chart illustrates December temperature patterns in Irvine, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Irvine, December typically has an average temperature of 13°C (56°F), with highs reaching up to 28°C (82°F) and lows dropping to around 4°C (39°F).

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

December Precipitation in Irvine

In Irvine in December, the total precipitation amount is 74 mm (2.9 in) over a span of 5 days.

December Precipitation Trends in Irvine

The chart displays monthly precipitation patterns in Irvine, 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 Irvine, December typically receives around 74 mm (2.9 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 Irvine

In Irvine in December humidity is 71%. With an average temperature of 13°C (56°F), this humidity feels like a damp embrace that can make exploring the area feel a bit stifling and requires light, breathable clothing to remain comfortable while traveling.

December Average Humidity in Irvine

This chart illustrates the average monthly humidity levels in Irvine, 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 Irvine is approximately 71%, 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 Irvine

In Irvine in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Irvine for better planning.

Maximum UV Index Levels in Irvine for December

The chart shows the monthly maximum UV Index (UVI) for Irvine 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 Irvine typically reaches 4, which falls under the moderate exposure category.

Data source: Irvine 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 Irvine Compares to Other Months

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

This table compares monthly weather conditions in Irvine, 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 (56°F)	71 mm (2.8 inches)	74%	moderate
February Weather	13°C (56°F)	60 mm (2.3 inches)	79%	high
March Weather	14°C (58°F)	68 mm (2.7 inches)	75%	very high
April Weather	17°C (62°F)	27 mm (1.1 inches)	70%	very high
May Weather	17°C (64°F)	13 mm (0.5 inches)	70%	extreme
June Weather	20°C (68°F)	1 mm (0.0 inches)	72%	extreme
July Weather	23°C (73°F)	2 mm (0.1 inches)	73%	extreme
August Weather	23°C (74°F)	2 mm (0.1 inches)	69%	very high
September Weather	22°C (72°F)	3 mm (0.1 inches)	68%	very high
October Weather	20°C (69°F)	10 mm (0.4 inches)	67%	high
November Weather	17°C (62°F)	25 mm (1.0 inches)	68%	moderate
December Weather	13°C (56°F)	74 mm (2.9 inches)	71%	moderate