2025 Compare Climate & Weather:
Pomona, CA vs Riverside, CA

Highlights

On average, there are 277 sunny days per year in Riverside. Pomona averages 285 sunny days per year. The US average is 205 sunny days.

Riverside, California gets 11.3 inches of rain, on average, per year. Pomona, California gets 17.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Riverside averages 0 inches of snow per year. Pomona averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Pomona, California
Summer High: the July high is around 91.3 degrees
Winter Low: the January low is 42.2
Rain: averages 17.1 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Pomona is 8.8 (10=best), which means it is more comfortable than most places in California.

Today's Weather - Pomona, CA

51°F

Today's Weather - Riverside, CA

56°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Pomona / Riverside

August is the hottest month for Pomona with an average high temperature of 92.9°, which ranks it as warmer than most places in California. In Pomona, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Pomona are May, October and April.

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.

December has the coldest nighttime temperatures for Pomona with an average of 41.0°. This is warmer than most places in California.

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

In Pomona, there are 75.6 days annually when the high temperature is over 90°, which is hotter than most places in California.

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

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

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 Pomona, 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 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.

February is the wettest month in Pomona with 4.3 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 61% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 17.1 inches in Pomona means that it is about average compared to other places in California.


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.

February is the rainiest month in Pomona with 5.8 days of rain, and July is the driest month with only 0.2 rainy days. There are 32.0 rainy days annually in Pomona, which is less rainy than most places in California. The rainiest season is Spring when it rains 49% of the time and the driest is Autumn with only a 4% chance of a rainy day.

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.

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

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

Any measurable snowfall is a rare occurance in Pomona.

Any measurable snowfall is a rare occurance in Riverside.