January Weather in San Carlos, United States

Last updated: June 24, 2025

In January, the average temperature in San Carlos, United States is a pleasant 12°C (54°F). Temperatures can range from a brisk -1°C (31°F) at their lowest to a warm 28°C (83°F) at their peak. Prepare for some rain, as 24 mm (0.9 in) of precipitation is expected over 3 days, and expect an average humidity of 76%.

January Temperature in San Carlos

In January in San Carlos, the average temperature is 12°C (54°F). Maximums can reach 28°C (83°F), while minimums can drop as low as -1°C (31°F). Travelers should be prepared for a wide range of temperatures during this time.

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

The chart illustrates January temperature patterns in San Carlos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Carlos, January typically has an average temperature of 12°C (54°F), with highs reaching up to 28°C (83°F) and lows dropping to around -1°C (31°F).

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

January Precipitation in San Carlos

In San Carlos in January, the precipitation amount is 24 mm (0.9 in) over a span of 3 days.

January Precipitation Trends in San Carlos

The chart displays monthly precipitation patterns in San Carlos, 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 Carlos, January typically receives around 24 mm (0.9 inches) of precipitation spread over approximately 3 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 San Carlos

In San Carlos in January, humidity is 76%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities a bit uncomfortable and requiring frequent hydration while exploring.

January Average Humidity in San Carlos

This chart illustrates the average monthly humidity levels in San Carlos, 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 Carlos is approximately 76%, 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 Carlos

In San Carlos 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 San Carlos for better planning.

Maximum UV Index Levels in San Carlos for January

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

Data source: San Carlos 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 Carlos Compares to Other Months

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

This table compares monthly weather conditions in San Carlos, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	24 mm (0.9 inches)	76%	moderate
February Weather	14°C (57°F)	36 mm (1.4 inches)	79%	high
March Weather	18°C (65°F)	23 mm (0.9 inches)	67%	very high
April Weather	24°C (75°F)	2 mm (0.1 inches)	55%	extreme
May Weather	27°C (82°F)	2 mm (0.1 inches)	40%	extreme
June Weather	33°C (92°F)	3 mm (0.1 inches)	33%	extreme
July Weather	35°C (95°F)	37 mm (1.5 inches)	34%	extreme
August Weather	34°C (94°F)	35 mm (1.4 inches)	48%	extreme
September Weather	31°C (88°F)	24 mm (0.9 inches)	64%	very high
October Weather	24°C (76°F)	21 mm (0.8 inches)	67%	very high
November Weather	19°C (66°F)	19 mm (0.7 inches)	77%	moderate
December Weather	13°C (55°F)	26 mm (1.0 inches)	82%	moderate