January Weather in Riverside, United States

Last updated: June 24, 2025

In January, the average temperature in Riverside, United States hovers around 2°C (36°F), with a notable range from a chilly -14°C (7°F) to a mild 15°C (60°F). Expect 79 mm (3.1 in) of precipitation across 8 days, contributing to a high average humidity of 84%. Prepare accordingly for a weather experience that balances cold and damp!

January Temperature in Riverside

In January in Riverside, the average temperature is 2°C (36°F), with maximums reaching 15°C (60°F) and minimums dropping to as low as -14°C (7°F). This variability in temperature makes it essential for travelers to pack accordingly, ensuring they are prepared for both mild and frigid conditions.

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 2°C (36°F), with highs reaching up to 15°C (60°F) and lows dropping to around -14°C (7°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 79 mm (3.1 in) during 8 days, indicating a relatively wet period for the area.

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 79 mm (3.1 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 84%. With an average temperature of 2°C (36°F), this humidity feels like a cold, damp blanket wrapping around you, making outdoor activities less inviting and requiring extra layers to stay comfortable while traveling.

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 84%, 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	2°C (36°F)	79 mm (3.1 inches)	84%	moderate
February Weather	2°C (37°F)	106 mm (4.2 inches)	82%	moderate
March Weather	4°C (40°F)	101 mm (4.0 inches)	81%	high
April Weather	9°C (49°F)	126 mm (5.0 inches)	78%	very high
May Weather	14°C (58°F)	114 mm (4.5 inches)	69%	very high
June Weather	20°C (68°F)	76 mm (3.0 inches)	69%	very high
July Weather	24°C (75°F)	117 mm (4.6 inches)	62%	very high
August Weather	24°C (75°F)	96 mm (3.8 inches)	65%	very high
September Weather	21°C (70°F)	89 mm (3.5 inches)	68%	very high
October Weather	16°C (61°F)	139 mm (5.5 inches)	74%	high
November Weather	9°C (49°F)	100 mm (3.9 inches)	82%	moderate
December Weather	5°C (41°F)	137 mm (5.4 inches)	80%	low