January Weather in San Leandro, United States

Last updated: June 24, 2025

In San Leandro, United States, the average temperature in January hovers around 10°C (51°F). Expect a minimum of 0°C (32°F) and a maximum of 25°C (78°F) during this month. Precipitation is notable, with about 94 mm (3.7 in) falling over 8 days, and an average humidity of 82% will keep the air feeling quite moist.

January Temperature in San Leandro

In January in San Leandro, the average temperature is 10°C (51°F). The maximum can reach 25°C (78°F), while the minimum can drop to as low as 0°C (32°F). Be sure to pack layers for your trip, as temperatures can vary significantly throughout the day.

January Weather in San Leandro: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in San Leandro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Leandro, January typically has an average temperature of 10°C (51°F), with highs reaching up to 25°C (78°F) and lows dropping to around 0°C (32°F).

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

January Precipitation in San Leandro

In San Leandro in January, the precipitation amount is 94 mm (3.7 in) over the course of 8 days.

January Precipitation Trends in San Leandro

The chart displays monthly precipitation patterns in San Leandro, 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 San Leandro, January typically receives around 94 mm (3.7 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 San Leandro

In San Leandro in January humidity is 82%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill that clings to your skin, making outdoor adventures less appealing and prompting travelers to seek cozy indoor activities or warm drinks to counter the brisk air.

January Average Humidity in San Leandro

This chart illustrates the average monthly humidity levels in San Leandro, 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 San Leandro is approximately 82%, 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 San Leandro

In San Leandro 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 San Leandro, you can check the information here.

Maximum UV Index Levels in San Leandro for January

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

Data source: San Leandro 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 San Leandro Compares to Other Months

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

This table compares monthly weather conditions in San Leandro, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	94 mm (3.7 inches)	82%	moderate
February Weather	11°C (53°F)	91 mm (3.6 inches)	84%	moderate
March Weather	12°C (54°F)	73 mm (2.9 inches)	82%	very high
April Weather	14°C (58°F)	29 mm (1.2 inches)	78%	very high
May Weather	15°C (60°F)	18 mm (0.7 inches)	71%	very high
June Weather	18°C (64°F)	2 mm (0.1 inches)	64%	extreme
July Weather	18°C (64°F)	0 mm (0.0 inches)	58%	extreme
August Weather	18°C (65°F)	0 mm (0.0 inches)	54%	very high
September Weather	19°C (66°F)	1 mm (0.0 inches)	55%	very high
October Weather	17°C (63°F)	24 mm (1.0 inches)	62%	high
November Weather	13°C (56°F)	42 mm (1.7 inches)	78%	moderate
December Weather	10°C (51°F)	80 mm (3.2 inches)	80%	moderate