January Weather in Millbrae, United States

Last updated: June 24, 2025

In January, the average temperature in Millbrae, United States hovers around 11°C (53°F), with a minimum of 5°C (41°F) and a maximum of 20°C (68°F). Expect 102 mm (4.0 in) of precipitation spread over 9 days, and note that the average humidity level is quite high at 85%. Stay prepared for a mix of weather!

January Temperature in Millbrae

In January in Millbrae, the average temperature is 11°C (53°F). The maximum can reach 20°C (68°F), while the minimum can be as low as 5°C (41°F). This mild climate makes Millbrae a great destination for travelers looking to enjoy pleasant outdoor activities.

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

The chart illustrates January temperature patterns in Millbrae, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Millbrae, January typically has an average temperature of 11°C (53°F), with highs reaching up to 20°C (68°F) and lows dropping to around 5°C (41°F).

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

January Precipitation in Millbrae

In Millbrae in January, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.

January Precipitation Trends in Millbrae

The chart displays monthly precipitation patterns in Millbrae, 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 Millbrae, January typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 9 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 Millbrae

In Millbrae in January humidity is 85%. With an average temperature of 11°C (53°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and creating a dampness in the air that can be exhausting for travelers.

January Average Humidity in Millbrae

This chart illustrates the average monthly humidity levels in Millbrae, 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 Millbrae is approximately 85%, 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 Millbrae

In Millbrae 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 Millbrae, you can check the information here.

Maximum UV Index Levels in Millbrae for January

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

Data source: Millbrae 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 Millbrae Compares to Other Months

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

This table compares monthly weather conditions in Millbrae, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	11°C (53°F)	102 mm (4.0 inches)	85%	moderate
February Weather	11°C (53°F)	101 mm (4.0 inches)	82%	moderate
March Weather	12°C (53°F)	77 mm (3.0 inches)	82%	very high
April Weather	12°C (55°F)	34 mm (1.3 inches)	79%	very high
May Weather	13°C (56°F)	22 mm (0.9 inches)	83%	very high
June Weather	15°C (58°F)	4 mm (0.2 inches)	84%	extreme
July Weather	15°C (59°F)	3 mm (0.1 inches)	87%	extreme
August Weather	16°C (61°F)	3 mm (0.1 inches)	87%	very high
September Weather	16°C (62°F)	3 mm (0.1 inches)	86%	very high
October Weather	15°C (60°F)	27 mm (1.1 inches)	80%	high
November Weather	13°C (56°F)	48 mm (1.9 inches)	79%	moderate
December Weather	12°C (53°F)	92 mm (3.6 inches)	79%	moderate