Rialto, CA Weather Forecast & Monthly Average Temperatures

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Rialto Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	43°F	66°F	54°F	11.6"
February	47°F	67°F	56°F	9.6"
March	48°F	74°F	60°F	2.1"
April	50°F	76°F	61°F	4.1"
May	55°F	81°F	66°F	4.8"
June	58°F	86°F	70°F	0.1"
July	65°F	94°F	78°F	0.2"
August	65°F	95°F	78°F	2.3"
September	60°F	88°F	72°F	2.1"
October	57°F	82°F	67°F	4.3"
November	50°F	77°F	62°F	7.7"
December	43°F	67°F	55°F	3.3"

Did you know?

The highest monthly average temperature in Rialto for August is 78 degrees.
The lowest monthly average temperature in Rialto for January is 54 degrees.
The most monthly precipitation in Rialto occurs in January with 11.6 inches.
The air quality index in Rialto is 70% worse than the national average.
The pollution index in Rialto is 523% worse than the national average.

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Compare Rialto, CA Weather To Other Cities

Rialto air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
Index	Rialto	California	National
Air quality index	85	55	50
Pollution index	31,575,300	18,106,726	5,066,862

Rialto air quality information

Measurement	Total
Days measured	365
Days with good air quality	24
Days with moderate air quality	211
Days w/ poor A.Q. for sensitive groups	102
Days with unhealthy air quality	25

Rialto air quality information

Pollutant	Total
Arsenic	0.110%
Benzene	0.260%
Carbon Tetrachloride	0.020%
Lead	0.350%
Mercury	0.280%

Average monthly Rialto temperature with heat index

Rialto monthly precipitation with daily maximum

Rialto monthly snow depth with daily maximum

Rialto monthly wind speed information

Nearby cities with good air quality

City, State	Population	Air Quality Index	National Avg.
Eastvale, CA	58,217	85	70%
Highland, CA	54,490	85	70%
Lytle Creek, CA	1,019	85	70%
Ontario, CA	169,389	85	70%
San Bernardino, CA	214,581	85	70%
Rialto, CA	102,418	85	70%

Cities with similar population

City, State	Population	Air Quality Index	National Avg.
Lewisville, TX	102,327	54	8%
Davenport, IA	102,305	55	10%
San Mateo, CA	102,224	48	4%
Sandy Springs, GA	102,212	52	4%
Clovis, CA	102,148	80	60%
Rialto, CA	102,418	85	70%

Source: The Rialto, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.