January Weather in Riverside, United States

Last updated: June 24, 2025

In January, the average temperature in Riverside, United States hovers around -3°C (27°F), with extremes ranging from a chilly -29°C (-20°F) to a mild 14°C (57°F). Expect about 32 mm (1.3 in) of precipitation spread across 8 days, contributing to an average humidity of 91%.

January Temperature in Riverside

In January in Riverside, the average temperature is -3°C (27°F). Maximums can reach 14°C (57°F) and minimums can be as low as -29°C (-20°F). It's a great time for travelers who enjoy winter activities and the charm of a snowy landscape.

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

The chart illustrates January temperature patterns in Riverside, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riverside, January typically has an average temperature of -3°C (27°F), with highs reaching up to 14°C (57°F) and lows dropping to around -29°C (-20°F).

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

January Precipitation in Riverside

In Riverside in January, the precipitation amount is 32 mm (1.3 in) over the course of 8 days.

January Precipitation Trends in Riverside

The chart displays monthly precipitation patterns in Riverside, 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 Riverside, January typically receives around 32 mm (1.3 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 Riverside

In Riverside in January humidity is 91%. With an average temperature of -3°C (27°F), this humidity feels like a thick, icy blanket wrapping around you, making travel quite uncomfortable as every breath is a mix of frigid air and moisture, and the cold dampness clings to your skin, turning even short outings into a test of endurance.

January Average Humidity in Riverside

This chart illustrates the average monthly humidity levels in Riverside, 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 Riverside is approximately 91%, 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 Riverside

In Riverside 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 Riverside, you can check the information here.

Maximum UV Index Levels in Riverside for January

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

Data source: Riverside 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 Riverside Compares to Other Months

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

This table compares monthly weather conditions in Riverside, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	32 mm (1.3 inches)	91%	moderate
February Weather	-1°C (31°F)	40 mm (1.6 inches)	92%	moderate
March Weather	5°C (41°F)	40 mm (1.6 inches)	85%	high
April Weather	9°C (48°F)	37 mm (1.4 inches)	76%	very high
May Weather	14°C (58°F)	43 mm (1.7 inches)	66%	very high
June Weather	20°C (69°F)	20 mm (0.8 inches)	62%	extreme
July Weather	25°C (78°F)	7 mm (0.3 inches)	53%	extreme
August Weather	24°C (75°F)	11 mm (0.4 inches)	42%	very high
September Weather	18°C (64°F)	20 mm (0.8 inches)	46%	very high
October Weather	8°C (48°F)	29 mm (1.1 inches)	64%	high
November Weather	3°C (38°F)	22 mm (0.9 inches)	83%	moderate
December Weather	-2°C (29°F)	33 mm (1.3 inches)	87%	moderate