Hourly Weather Forecast for Rialto, California

Hourly Weather | Today › Wednesday, August 5, 2026

Active Weather Warnings

Heat Advisory

Rialto, California

3 AM

66°

Feels Like 66°

Humidity: 75%

UV Index: 0

Wind: 1 mph

4 AM

66°

Feels Like 64°

Humidity: 78%

UV Index: 0

Wind: 1 mph

5 AM

66°

Feels Like 66°

Humidity: 80%

UV Index: 0

Wind: 0 mph

6 AM

66°

Feels Like 66°

Humidity: 78%

UV Index: 0

Wind: 0 mph

7 AM

66°

Feels Like 70°

Humidity: 77%

UV Index: 1

Wind: 1 mph

8 AM

72°

Feels Like 75°

Humidity: 66%

UV Index: 2

Wind: 4 mph

9 AM

79°

Feels Like 81°

Humidity: 54%

UV Index: 3

Wind: 5 mph

10 AM

81°

Feels Like 86°

Humidity: 47%

UV Index: 5

Wind: 5 mph

11 AM

84°

Feels Like 91°

Humidity: 41%

UV Index: 7

Wind: 6 mph

12 PM

90°

Feels Like 97°

Humidity: 35%

UV Index: 10

Wind: 7 mph

1 PM

91°

Feels Like 99°

Humidity: 29%

UV Index: 11

Wind: 7 mph

2 PM

93°

Feels Like 100°

Humidity: 26%

UV Index: 10

Wind: 8 mph

3 PM

97°

Feels Like 100°

Humidity: 25%

UV Index: 7

Wind: 9 mph

4 PM

95°

Feels Like 97°

Humidity: 26%

UV Index: 5

Wind: 10 mph

5 PM

93°

Feels Like 93°

Humidity: 28%

UV Index: 3

Wind: 10 mph

6 PM

91°

Feels Like 91°

Humidity: 31%

UV Index: 2

Wind: 9 mph

7 PM

90°

Feels Like 88°

Humidity: 35%

UV Index: 1

Wind: 8 mph

8 PM

84°

Feels Like 82°

Humidity: 41%

UV Index: 0

Wind: 8 mph

9 PM

82°

Feels Like 81°

Humidity: 46%

UV Index: 0

Wind: 7 mph

10 PM

81°

Feels Like 79°

Humidity: 51%

UV Index: 0

Wind: 6 mph

11 PM

79°

Feels Like 75°

Humidity: 55%

UV Index: 0

Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 AM

36 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 8.56 µg/m³
PM₁₀: 24.78 µg/m³
O₃: 0.036 ppm
NO₂: 1.4 ppb
SO₂: 0.6 ppb
CO: 0.08 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

4 AM

37 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 8.83 µg/m³
PM₁₀: 25.86 µg/m³
O₃: 0.035 ppm
NO₂: 1.6 ppb
SO₂: 0.7 ppb
CO: 0.08 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 AM

38 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 9.07 µg/m³
PM₁₀: 26.75 µg/m³
O₃: 0.035 ppm
NO₂: 1.6 ppb
SO₂: 0.7 ppb
CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 AM

39 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 9.3 µg/m³
PM₁₀: 27.48 µg/m³
O₃: 0.034 ppm
NO₂: 1.7 ppb
SO₂: 0.8 ppb
CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 AM

40 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 9.55 µg/m³
PM₁₀: 28.24 µg/m³
O₃: 0.033 ppm
NO₂: 1.9 ppb
SO₂: 0.8 ppb
CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 AM

41 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 9.77 µg/m³
PM₁₀: 28.87 µg/m³
O₃: 0.034 ppm
NO₂: 1.9 ppb
SO₂: 0.8 ppb
CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 AM

41 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 9.85 µg/m³
PM₁₀: 28.74 µg/m³
O₃: 0.036 ppm
NO₂: 1.5 ppb
SO₂: 0.8 ppb
CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 AM

42 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 10.19 µg/m³
PM₁₀: 29.04 µg/m³
O₃: 0.038 ppm
NO₂: 1.1 ppb
SO₂: 0.7 ppb
CO: 0.08 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 AM

46 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 11.05 µg/m³
PM₁₀: 30.09 µg/m³
O₃: 0.042 ppm
NO₂: 0.7 ppb
SO₂: 0.6 ppb
CO: 0.08 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

12 PM

50 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 11.89 µg/m³
PM₁₀: 31.19 µg/m³
O₃: 0.045 ppm
NO₂: 0.4 ppb
SO₂: 0.6 ppb
CO: 0.08 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

1 PM

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.32 µg/m³
PM₁₀: 31.9 µg/m³
O₃: 0.045 ppm
NO₂: 0.2 ppb
SO₂: 0.5 ppb
CO: 0.08 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

2 PM

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.41 µg/m³
PM₁₀: 32.23 µg/m³
O₃: 0.044 ppm
NO₂: 0.2 ppb
SO₂: 0.4 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

3 PM

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.35 µg/m³
PM₁₀: 32.31 µg/m³
O₃: 0.043 ppm
NO₂: 0.2 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

4 PM

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.29 µg/m³
PM₁₀: 32.25 µg/m³
O₃: 0.042 ppm
NO₂: 0.2 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

5 PM

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.25 µg/m³
PM₁₀: 31.98 µg/m³
O₃: 0.042 ppm
NO₂: 0.3 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

6 PM

50 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.17 µg/m³
PM₁₀: 31.21 µg/m³
O₃: 0.042 ppm
NO₂: 0.4 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM

50 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.18 µg/m³
PM₁₀: 30.64 µg/m³
O₃: 0.042 ppm
NO₂: 0.6 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.27 µg/m³
PM₁₀: 30.3 µg/m³
O₃: 0.041 ppm
NO₂: 0.7 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

9 PM

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.36 µg/m³
PM₁₀: 30.09 µg/m³
O₃: 0.041 ppm
NO₂: 0.7 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 PM

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.54 µg/m³
PM₁₀: 30.21 µg/m³
O₃: 0.040 ppm
NO₂: 0.6 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

11 PM

52 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.88 µg/m³
PM₁₀: 30.84 µg/m³
O₃: 0.040 ppm
NO₂: 0.6 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Rialto

Moderate Expected Likely

Heat Advisory

Heat Advisory issued August 4 at 9:35PM PDT until August 8 at 8:00PM PDT by NWS San Diego CA

Aug 4, 9:35 PM → Aug 8, 8:00 PM

WHAT: High temperatures in the upper 90s to 105 expected.

WHERE: San Bernardino and Riverside County Valleys-The Inland
Empire.

WHEN: Until 8 PM PDT Saturday.

IMPACTS: Hot temperatures may cause heat illnesses.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Updated: Aug 5, 1:42 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Rialto

Heat Advisory

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