Rialto, California 

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Climate in Rialto, California

Rialto, California gets 14 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Rialto averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 282 sunny days per year in Rialto. The US average is 205 sunny days.

Rialto gets some kind of precipitation, on average, 40 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 95 degrees
Winter Low: the January low is 42
Rain: averages 14 inches of rain a year
Snow: averages 0 inches of snow a year


The annual BestPlaces Comfort Index for Rialto is 8.6 (10=best), which means it is more comfortable than most places in California.

8.6 / 10
May, October and April are the most pleasant months in Rialto, while August and July are the least comfortable months.

Climate Averages
  Rialto, CaliforniaUnited States
  14.4 in.38.1 in.
  0.0 in.27.8 in.
  40.1 days106.2 days
  282 days205 days
  1257 ft.2443 ft.


Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for Rialto with an average high temperature of 96.0°, which ranks it as warmer than most places in California. In Rialto, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rialto are April, May and November.

December has the coldest nighttime temperatures for Rialto with an average of 40.9°. This is warmer than most places in California.

In Rialto, there are 102.2 days annually when the high temperature is over 90°, which is hotter than most places in California.

In Rialto, there are 3.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Rialto, 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 Rialto with 3.5 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 59% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 14.4 inches in Rialto means that it is drier than most places in California.

February is the rainiest month in Rialto with 7.1 days of rain, and August is the driest month with only 0.6 rainy days. There are 40.1 rainy days annually in Rialto, which is less rainy than most places in California. The rainiest season is Spring when it rains 46% of the time and the driest is Autumn with only a 5% chance of a rainy day.

There is rarely any recorded snowfall in Rialto, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Rialto.

  • Annual Rainfall (US Avg: 36.5")
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    Reviews for Rialto    6 Reviews
    city on the move to the future - 4/7/2020
    Rialto has come a long way lots of places to shop and eat catch a movie friendly people... Read More

    Start Your Review of Rialto

    New College Grads - 6/26/2008
    I live in Rialto, about 1 hour outside of Los Angeles, and even though it is cheaper than Los Angeles, the average college graduate cannot afford to stay here. First,... Read More

    Rialto...Don't move here! - 5/14/2007
    I wouldn't say the people here are especially unfriendly. They are typical for California. We're not unfriendly, we've just been taught to be extremely cautious and keep... Read More

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