2025 Compare Climate & Weather:
Riverside, CA vs Oro Valley, AZ

Highlights

On average, there are 279 sunny days per year in Oro Valley. Riverside averages 277 sunny days per year. The US average is 205 sunny days.

Oro Valley, Arizona gets 13.5 inches of rain, on average, per year. Riverside, California gets 11.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Oro Valley averages 0.3 inches of snow per year. Riverside averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Oro Valley, Arizona
Summer High: the July high is around 100.2 degrees
Winter Low: the January low is 36.9
Rain: averages 13.5 inches of rain a year
Snow: averages 0.3 inches of snow a year

Riverside, California
Summer High: the July high is around 94.2 degrees
Winter Low: the January low is 42.4
Rain: averages 11.3 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Oro Valley is 7.6 (10=best), which means it is about average compared to other places in Arizona.

The annual BestPlaces Comfort Index for Riverside is 8.7 (10=best), which means it is more comfortable than most places in California.

Today's Weather - Riverside, CA

56°F

Today's Weather - Oro Valley, AZ

50°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Riverside / Oro Valley

August is the hottest month for Riverside with an average high temperature of 95.4°, which ranks it as warmer than most places in California. In Riverside, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Riverside are April, May and November.

June is the hottest month for Oro Valley with an average high temperature of 100.5°, which ranks it as warmer than most places in Arizona. In Oro Valley, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Oro Valley are November, March and April.

December has the coldest nighttime temperatures for Riverside with an average of 41.3°. This is warmer than most places in California.

December has the coldest nighttime temperatures for Oro Valley with an average of 35.8°. This is warmer than most places in Arizona.

In Riverside, there are 95.9 days annually when the high temperature is over 90°, which is hotter than most places in California.

In Oro Valley, there are 147.2 days annually when the high temperature is over 90°, which is hotter than most places in Arizona.

In Riverside, there are 4.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Oro Valley, there are 30.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Arizona.

In Riverside, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

In Oro Valley, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Arizona.

February is the wettest month in Riverside with 2.7 inches of rain, and the driest month is June with 0.1 inches. The wettest season is Spring with 59% of yearly precipitation and 3% occurs in Autumn, which is the driest season. The annual rainfall of 11.3 inches in Riverside means that it is drier than most places in California.


August is the wettest month in Oro Valley with 2.6 inches of rain, and the driest month is May with 0.3 inches. The wettest season is Autumn with 38% of yearly precipitation and 13% occurs in Summer, which is the driest season. The annual rainfall of 13.5 inches in Oro Valley means that it is wetter than most places in Arizona.

February is the rainiest month in Riverside with 6.2 days of rain, and August is the driest month with only 0.4 rainy days. There are 34.0 rainy days annually in Riverside, which is less rainy than most places in California. The rainiest season is Spring when it rains 48% of the time and the driest is Autumn with only a 5% chance of a rainy day.

August is the rainiest month in Oro Valley with 9.5 days of rain, and June is the driest month with only 1.2 rainy days. There are 51.0 rainy days annually in Oro Valley, which is about average compared to other places in Arizona. The rainiest season is Autumn when it rains 37% of the time and the driest is Summer with only a 15% chance of a rainy day.

There is rarely any recorded snowfall in Riverside, ranking it as one of the least snowy places in California.

An annual snowfall of 0.3 inches in Oro Valley means that it is about average compared to other places in Arizona.

Any measurable snowfall is a rare occurance in Riverside.

December is the snowiest month in Oro Valley with 0.1 inches of snow, and no months of the year have significant snowfall.