January Weather in Riverside, United States

Last updated: June 24, 2025

In Riverside, United States, the average temperature in January hovers around 8°C (47°F). Expect to experience a range with minimums dipping to -12°C (11°F) and maximums reaching up to 26°C (79°F). During this month, you'll also encounter around 119 mm (4.7 in) of precipitation over approximately 10 days, accompanied by a notable average humidity of 85%. Prepare accordingly!

January Temperature in Riverside

In January in Riverside, the average temperature is 8°C (47°F), with maximums reaching 26°C (79°F) and minimums dropping as low as -12°C (11°F). It’s advisable to pack layers to stay comfortable while exploring the varied climate.

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 8°C (47°F), with highs reaching up to 26°C (79°F) and lows dropping to around -12°C (11°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 total precipitation amount is 119 mm (4.7 in) over the span of 10 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 119 mm (4.7 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Riverside

In Riverside in January humidity is 85%. With an average temperature of 8°C (47°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities feel less refreshing and more uncomfortable for 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 85%, 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 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Riverside for better planning.

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 4, 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	8°C (47°F)	119 mm (4.7 inches)	85%	moderate
February Weather	11°C (52°F)	161 mm (6.3 inches)	84%	high
March Weather	14°C (58°F)	134 mm (5.3 inches)	82%	very high
April Weather	17°C (63°F)	143 mm (5.6 inches)	82%	very high
May Weather	22°C (72°F)	104 mm (4.1 inches)	81%	extreme
June Weather	25°C (77°F)	142 mm (5.6 inches)	77%	extreme
July Weather	27°C (80°F)	110 mm (4.3 inches)	77%	extreme
August Weather	26°C (80°F)	130 mm (5.1 inches)	72%	very high
September Weather	25°C (76°F)	87 mm (3.4 inches)	73%	very high
October Weather	19°C (67°F)	120 mm (4.7 inches)	73%	high
November Weather	12°C (53°F)	86 mm (3.4 inches)	85%	high
December Weather	10°C (50°F)	144 mm (5.7 inches)	88%	moderate