Rialto, CA Weather - Forecast & Monthly Averages

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Key findings

The highest monthly average temperature in Rialto for August is 77.6 degrees
The lowest monthly average temperature in Rialto for January is 54.3 degrees
The most monthly precipitation in Rialto occurs in January with 11.6 inches
The air quality index in Rialto is 79% worse than the national average
The pollution index in Rialto is 1058% worse than the national average

Compare Rialto, CA Weather

Rialto Average Temperature

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"

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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	89	55	50
Pollution index	31,575,300	10,473,190	2,726,193

Rialto air quality information

Measurement	Total
Days measured	365
Days with good air quality	42
Days with moderate air quality	178
Days w/ poor A.Q. for sensitive groups	79
Days with unhealthy air quality	58

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	Population	Air Quality Index	National Avg.
Bloomington, CA	23,322	89	78.0%
Jurupa Valley, CA	100,737	89	78.0%
Riverside, CA	318,678	89	78.0%
Rancho Cucamonga, CA	173,309	89	78.0%
Lytle Creek, CA	1,019	89	78.0%
Rialto, CA	102,418	89	78.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Lewisville, TX	102,327	51	2.0%
Davenport, IA	102,305	46	8.0%
San Mateo, CA	102,224	43	14.0%
Sandy Springs, GA	102,212	52	4.0%
Clovis, CA	102,148	60	20.0%
Rialto, CA	102,418	89	78.0%

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.