January Weather in Brentwood, United States

Last updated: June 24, 2025

In January, the average temperature in Brentwood, United States hovers around -2°C (29°F). Expect a chilly range with minimums plummeting to -21°C (-6°F) and maximums reaching up to 19°C (67°F). With an average humidity of 86% and 72 mm (2.8 in) of precipitation spread over 8 days, prepare for a damp and brisk atmosphere.

January Temperature in Brentwood

In January in Brentwood, the average temperature is -2°C (29°F), with maximums reaching up to 19°C (67°F) and minimums plummeting as low as -21°C (-6°F). Be sure to pack accordingly to experience the full range of temperatures during your travels.

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

The chart illustrates January temperature patterns in Brentwood, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brentwood, January typically has an average temperature of -2°C (29°F), with highs reaching up to 19°C (67°F) and lows dropping to around -21°C (-6°F).

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

January Precipitation in Brentwood

In Brentwood in January, the precipitation amount is 72 mm (2.8 in) over the course of 8 days.

January Precipitation Trends in Brentwood

The chart displays monthly precipitation patterns in Brentwood, 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 Brentwood, January typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Brentwood

In Brentwood in January humidity is 86%. With an average temperature of -2°C (29°F), this humidity feels like a damp chill that seeps through layers of clothing, making outdoor activities uncomfortable and travel plans challenging.

January Average Humidity in Brentwood

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

In Brentwood in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Brentwood, you can check the information here.

Maximum UV Index Levels in Brentwood for January

The chart shows the monthly maximum UV Index (UVI) for Brentwood 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 Brentwood typically reaches 3, which falls under the moderate exposure category.

Data source: Brentwood 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 Brentwood Compares to Other Months

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

This table compares monthly weather conditions in Brentwood, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	72 mm (2.8 inches)	86%	moderate
February Weather	-1°C (31°F)	90 mm (3.5 inches)	84%	moderate
March Weather	2°C (36°F)	86 mm (3.4 inches)	82%	moderate
April Weather	8°C (47°F)	131 mm (5.2 inches)	80%	very high
May Weather	14°C (58°F)	78 mm (3.1 inches)	72%	very high
June Weather	20°C (68°F)	91 mm (3.6 inches)	72%	very high
July Weather	23°C (73°F)	135 mm (5.3 inches)	67%	very high
August Weather	22°C (73°F)	78 mm (3.1 inches)	66%	very high
September Weather	19°C (66°F)	73 mm (2.9 inches)	71%	high
October Weather	13°C (55°F)	131 mm (5.2 inches)	78%	moderate
November Weather	5°C (41°F)	102 mm (4.0 inches)	84%	moderate
December Weather	0°C (32°F)	126 mm (5.0 inches)	81%	low