August Weather in Riverside, United States

Last updated: June 24, 2025

In August, the average temperature in Riverside, United States is a delightful 24°C (75°F). However, be prepared for some fluctuations, as temperatures can dip as low as 5°C (41°F) or soar up to 39°C (102°F). Expect a bit of moisture too, with an average precipitation of 11 mm (0.4 in) spread over 3 days. Additionally, the climate boasts an average humidity of 42%, making it a comfortable time to enjoy your stay!

August Temperature in Riverside

In August in Riverside, the average temperature is 24°C (75°F). Maximum temperatures can reach 39°C (102°F), while minimums can drop as low as 5°C (41°F). This diverse temperature range makes Riverside an ideal destination for travelers looking to experience both warm and cooler climates during their visit.

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

The chart illustrates August 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, August typically has an average temperature of 24°C (75°F), with highs reaching up to 39°C (102°F) and lows dropping to around 5°C (41°F).

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

August Precipitation in Riverside

In Riverside in August, the precipitation amount is 11 mm (0.4 in) over the course of 3 days.

August Precipitation Trends in Riverside

The chart displays monthly precipitation patterns in Riverside, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Riverside, August typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 3 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

August Humidity in Riverside

In Riverside in August humidity is 42%. With an average temperature of 24°C (75°F), this humidity feels like a comfortable and pleasant environment for traveling, allowing you to explore the sights without feeling overly sticky or fatigued.

August Average Humidity in Riverside

This chart illustrates the average monthly humidity levels in Riverside, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Riverside is approximately 42%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Riverside

In Riverside in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Riverside.

Maximum UV Index Levels in Riverside for August

The chart shows the monthly maximum UV Index (UVI) for Riverside in August, 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 August, the maximum UV index in Riverside typically reaches 10, which falls under the very high exposure category.

Data source: Riverside August 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 August 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 August’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 August’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