January Weather in Monterey, United States

Last updated: June 24, 2025

In January, the average temperature in Monterey, United States hovers around 4°C (40°F). While you might experience a brisk chill with minimums dipping to -15°C (5°F), warmer days can reach a pleasant 22°C (72°F). Be prepared for some rain, as 108 mm (4.3 in) of precipitation is expected over 11 days, contributing to an average humidity of 87%.

January Temperature in Monterey

In January in Monterey, the average temperature is 4°C (40°F), with maximums reaching 22°C (72°F) and minimums dropping as low as -15°C (5°F). Be prepared for a wide range of temperatures whether you're planning outdoor adventures or cozy indoor activities.

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

The chart illustrates January temperature patterns in Monterey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monterey, January typically has an average temperature of 4°C (40°F), with highs reaching up to 22°C (72°F) and lows dropping to around -15°C (5°F).

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

January Precipitation in Monterey

In Monterey in January, the precipitation amount is 108 mm (4.3 in) over the course of 11 days.

January Precipitation Trends in Monterey

The chart displays monthly precipitation patterns in Monterey, 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 Monterey, January typically receives around 108 mm (4.3 inches) of precipitation spread over approximately 11 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 Monterey

In Monterey in January humidity is 87%. With an average temperature of 4°C (40°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it essential to dress warmly and prepare for damp conditions, which can dampen your spirits while traveling.

January Average Humidity in Monterey

This chart illustrates the average monthly humidity levels in Monterey, 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 Monterey is approximately 87%, 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 Monterey

In Monterey 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 Monterey, you can check the information here.

Maximum UV Index Levels in Monterey for January

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

Data source: Monterey 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 Monterey Compares to Other Months

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

This table compares monthly weather conditions in Monterey, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	108 mm (4.3 inches)	87%	moderate
February Weather	7°C (45°F)	192 mm (7.6 inches)	86%	high
March Weather	11°C (51°F)	161 mm (6.3 inches)	86%	high
April Weather	14°C (58°F)	153 mm (6.0 inches)	82%	very high
May Weather	20°C (68°F)	138 mm (5.4 inches)	82%	extreme
June Weather	23°C (74°F)	133 mm (5.2 inches)	83%	extreme
July Weather	25°C (78°F)	133 mm (5.2 inches)	80%	extreme
August Weather	24°C (76°F)	130 mm (5.1 inches)	74%	very high
September Weather	22°C (72°F)	119 mm (4.7 inches)	71%	very high
October Weather	17°C (62°F)	132 mm (5.2 inches)	78%	high
November Weather	9°C (48°F)	78 mm (3.1 inches)	88%	moderate
December Weather	7°C (44°F)	150 mm (5.9 inches)	88%	moderate