January Weather in Riverside, United States

Last updated: June 24, 2025

In January, the average temperature in Riverside, United States hovers around -1°C (31°F). Temperatures can vary widely, plunging to a brisk -23°C (-9°F) at times, while occasionally reaching a mild 17°C (63°F). Expect 53 mm (2.1 in) of precipitation spread over about 6 days, contributing to an average humidity of 80%.

January Temperature in Riverside

In January in Riverside, the average temperature is -1°C (31°F). The maximum can reach 17°C (63°F) and the minimum can be as low as -23°C (-9°F). Visitors should be prepared for a wide range of temperatures and pack accordingly for their trip.

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 -1°C (31°F), with highs reaching up to 17°C (63°F) and lows dropping to around -23°C (-9°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 53 mm (2.1 in) over a span of 6 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 53 mm (2.1 inches) of precipitation spread over approximately 6 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 80%. With average temperature -1°C (31°F), this humidity feels like a biting chill that seeps into your bones, making every step outdoors a brisk reminder of the cold.

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 80%, 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	-1°C (31°F)	53 mm (2.1 inches)	80%	moderate
February Weather	0°C (32°F)	36 mm (1.4 inches)	78%	moderate
March Weather	8°C (46°F)	94 mm (3.7 inches)	75%	high
April Weather	12°C (54°F)	82 mm (3.2 inches)	77%	very high
May Weather	19°C (66°F)	207 mm (8.1 inches)	82%	very high
June Weather	25°C (77°F)	92 mm (3.6 inches)	83%	extreme
July Weather	26°C (80°F)	104 mm (4.1 inches)	81%	extreme
August Weather	25°C (77°F)	117 mm (4.6 inches)	78%	very high
September Weather	22°C (72°F)	75 mm (2.9 inches)	72%	very high
October Weather	14°C (57°F)	112 mm (4.4 inches)	72%	high
November Weather	6°C (44°F)	45 mm (1.8 inches)	84%	moderate
December Weather	3°C (37°F)	34 mm (1.3 inches)	86%	moderate