January Weather in Brea, United States

Last updated: June 24, 2025

In January, the average temperature in Brea, United States typically hovers around 13°C (56°F). You can expect a minimum of 2°C (37°F) and a maximum soaring to 31°C (88°F). During this period, precipitation averages 75 mm (3.0 in) over approximately 5 days, while the humidity remains relatively high at 74%.

January Temperature in Brea

In January in Brea, the average temperature is 13°C (56°F), with maximums reaching up to 31°C (88°F) and minimums dropping as low as 2°C (37°F). This variation in temperature makes Brea an ideal destination for travelers who enjoy both warm days and cool evenings.

January Weather in Brea: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Brea, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brea, January typically has an average temperature of 13°C (56°F), with highs reaching up to 31°C (88°F) and lows dropping to around 2°C (37°F).

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

January Precipitation in Brea

In Brea in January, the precipitation amount is 75 mm (3.0 in) spread over a duration of 5 days.

January Precipitation Trends in Brea

The chart displays monthly precipitation patterns in Brea, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Brea, January typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 5 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Brea

In Brea in January humidity is 74%. With an average temperature of 13°C (56°F), this humidity feels like a damp chill that can make outdoor activities uncomfortable, especially for travelers unaccustomed to such conditions.

January Average Humidity in Brea

This chart illustrates the average monthly humidity levels in Brea, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Brea is approximately 74%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Brea

In Brea in January, 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 Brea for better planning.

Maximum UV Index Levels in Brea for January

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

Data source: Brea January 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 January Weather in Brea Compares to Other Months

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

This table compares monthly weather conditions in Brea, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	75 mm (3.0 inches)	74%	moderate
February Weather	13°C (56°F)	63 mm (2.5 inches)	79%	high
March Weather	14°C (58°F)	67 mm (2.7 inches)	75%	very high
April Weather	17°C (63°F)	23 mm (0.9 inches)	70%	very high
May Weather	18°C (65°F)	16 mm (0.6 inches)	70%	very high
June Weather	21°C (70°F)	3 mm (0.1 inches)	72%	extreme
July Weather	24°C (76°F)	2 mm (0.1 inches)	73%	extreme
August Weather	25°C (76°F)	2 mm (0.1 inches)	69%	very high
September Weather	23°C (74°F)	4 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)	20 mm (0.8 inches)	68%	moderate
December Weather	13°C (56°F)	72 mm (2.8 inches)	71%	moderate