January Weather in Riverside, United States

Last updated: June 24, 2025

In January, the average temperature in Riverside, United States hovers around 11°C (52°F). Expect a minimum dip to -9°C (16°F) and a maximum rise to 28°C (83°F). During this month, you'll encounter an average precipitation of 89 mm (3.5 in) spread across about 8 days, with a noticeable average humidity level of 79%.

January Temperature in Riverside

In January in Riverside, the average temperature is 11°C (52°F). The maximum can reach 28°C (83°F) and the minimum can be as low as -9°C (16°F). Be prepared for a wide range of temperatures while packing for your trip to Riverside during this month.

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 11°C (52°F), with highs reaching up to 28°C (83°F) and lows dropping to around -9°C (16°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 89 mm (3.5 in) over a span 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 89 mm (3.5 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 79%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that seeps through your clothes, making prolonged outdoor activities uncomfortable for travelers.

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 79%, 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 reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Riverside.

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 5, 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	11°C (52°F)	89 mm (3.5 inches)	79%	moderate
February Weather	13°C (55°F)	105 mm (4.1 inches)	80%	very high
March Weather	18°C (64°F)	80 mm (3.2 inches)	78%	very high
April Weather	20°C (68°F)	111 mm (4.4 inches)	79%	very high
May Weather	24°C (76°F)	191 mm (7.5 inches)	81%	extreme
June Weather	28°C (82°F)	130 mm (5.1 inches)	77%	extreme
July Weather	29°C (84°F)	82 mm (3.2 inches)	71%	extreme
August Weather	29°C (85°F)	142 mm (5.6 inches)	67%	extreme
September Weather	27°C (80°F)	121 mm (4.8 inches)	69%	very high
October Weather	22°C (71°F)	111 mm (4.4 inches)	73%	very high
November Weather	16°C (60°F)	82 mm (3.2 inches)	82%	high
December Weather	13°C (56°F)	116 mm (4.6 inches)	87%	moderate