January Weather in Ukiah, United States

Last updated: June 24, 2025

In Ukiah, United States, the average temperature in January hovers around 7°C (45°F), with a minimum dipping as low as -4°C (24°F) and a maximum reaching up to 22°C (72°F). Expect about 172 mm (6.8 in) of precipitation spread over 12 days, contributing to a high average humidity of 86%. Prepare for a blend of cool and wet conditions!

January Temperature in Ukiah

In January in Ukiah, the average temperature is 7°C (45°F). Maximum temperatures can reach 22°C (72°F), while the minimum can drop as low as -4°C (24°F). Be prepared for a range of weather conditions when traveling to Ukiah during this month.

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

The chart illustrates January temperature patterns in Ukiah, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ukiah, January typically has an average temperature of 7°C (45°F), with highs reaching up to 22°C (72°F) and lows dropping to around -4°C (24°F).

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

January Precipitation in Ukiah

In Ukiah in January, the precipitation amount reaches 172 mm (6.8 in) over the course of 12 days.

January Precipitation Trends in Ukiah

The chart displays monthly precipitation patterns in Ukiah, 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 Ukiah, January typically receives around 172 mm (6.8 inches) of precipitation spread over approximately 12 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 Ukiah

In Ukiah in January, humidity is 86%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration a bit uncomfortable and necessitating cozy layers to stay warm while navigating the moist air.

January Average Humidity in Ukiah

This chart illustrates the average monthly humidity levels in Ukiah, 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 Ukiah 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 Ukiah

In Ukiah 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 Ukiah, you can check the information here.

Maximum UV Index Levels in Ukiah for January

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

Data source: Ukiah 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 Ukiah Compares to Other Months

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

This table compares monthly weather conditions in Ukiah, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	172 mm (6.8 inches)	86%	moderate
February Weather	8°C (46°F)	170 mm (6.7 inches)	84%	moderate
March Weather	9°C (48°F)	135 mm (5.3 inches)	83%	high
April Weather	12°C (53°F)	79 mm (3.1 inches)	80%	very high
May Weather	15°C (58°F)	54 mm (2.1 inches)	80%	extreme
June Weather	19°C (67°F)	3 mm (0.1 inches)	76%	extreme
July Weather	22°C (72°F)	1 mm (0.0 inches)	70%	extreme
August Weather	22°C (72°F)	1 mm (0.1 inches)	66%	very high
September Weather	19°C (67°F)	7 mm (0.3 inches)	68%	very high
October Weather	15°C (59°F)	54 mm (2.1 inches)	72%	high
November Weather	10°C (50°F)	92 mm (3.6 inches)	84%	moderate
December Weather	7°C (45°F)	115 mm (4.5 inches)	84%	moderate