January Weather in Pleasant Hill, United States

Last updated: June 24, 2025

In January, the average temperature in Pleasant Hill, United States hovers around 4°C (40°F). Expect a chilly minimum of -17°C (2°F), with the occasional warm up to a pleasant 21°C (71°F). Prepare for some wet days, as 100 mm (3.9 in) of precipitation is likely over 9 days. Don’t forget, the air tends to be quite humid, with an average humidity of 86%.

January Temperature in Pleasant Hill

In January in Pleasant Hill, the average temperature is 4°C (40°F). Maximums can reach 21°C (71°F) and minimums can drop as low as -17°C (2°F). Be sure to pack layers to accommodate the wide range of temperatures while exploring.

January Weather in Pleasant Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Pleasant Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pleasant Hill, January typically has an average temperature of 4°C (40°F), with highs reaching up to 21°C (71°F) and lows dropping to around -17°C (2°F).

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

January Precipitation in Pleasant Hill

In Pleasant Hill in January, the precipitation amount is 100 mm (3.9 in) spread over 9 days.

January Precipitation Trends in Pleasant Hill

The chart displays monthly precipitation patterns in Pleasant Hill, 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 Pleasant Hill, January typically receives around 100 mm (3.9 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 Pleasant Hill

In Pleasant Hill in January humidity is 86%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel cumbersome as you navigate through a thick, heavy air that clings to your skin.

January Average Humidity in Pleasant Hill

This chart illustrates the average monthly humidity levels in Pleasant Hill, 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 Pleasant Hill 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 Pleasant Hill

In Pleasant Hill 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 Pleasant Hill, you can check the information here.

Maximum UV Index Levels in Pleasant Hill for January

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

Data source: Pleasant Hill 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 Pleasant Hill Compares to Other Months

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

This table compares monthly weather conditions in Pleasant Hill, 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)	100 mm (3.9 inches)	86%	moderate
February Weather	6°C (44°F)	169 mm (6.6 inches)	84%	high
March Weather	11°C (53°F)	160 mm (6.3 inches)	84%	high
April Weather	15°C (59°F)	159 mm (6.3 inches)	80%	very high
May Weather	21°C (70°F)	126 mm (5.0 inches)	82%	extreme
June Weather	25°C (78°F)	115 mm (4.5 inches)	83%	extreme
July Weather	27°C (81°F)	119 mm (4.7 inches)	79%	extreme
August Weather	26°C (79°F)	117 mm (4.6 inches)	76%	very high
September Weather	24°C (75°F)	105 mm (4.1 inches)	75%	very high
October Weather	17°C (63°F)	127 mm (5.0 inches)	74%	high
November Weather	9°C (49°F)	96 mm (3.8 inches)	85%	moderate
December Weather	7°C (45°F)	131 mm (5.1 inches)	88%	moderate