Hourly Weather | Today Wednesday, May 20, 2026
Active Weather Warnings
Tustin, California
4 PM
Sunny Weather
84°
Feels Like 86°
0
Humidity: 27%
UV Index: 5
Wind: 9 mph
5 PM
Cloudy Weather
82°
Feels Like 82°
0
Humidity: 29%
UV Index: 3
Wind: 9 mph
6 PM
Cloudy Weather
81°
Feels Like 81°
0
Humidity: 31%
UV Index: 2
Wind: 8 mph
7 PM
Cloudy Weather
79°
Feels Like 77°
0
Humidity: 35%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Night
73°
Feels Like 72°
0
Humidity: 42%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Night
72°
Feels Like 70°
0
Humidity: 50%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
68°
Feels Like 66°
0
Humidity: 59%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
64°
Feels Like 63°
0
Humidity: 69%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

4 PM
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.56 µg/m³
  • PM10: 23.31 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

5 PM
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.6 µg/m³
  • PM10: 24.18 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

6 PM
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.84 µg/m³
  • PM10: 25.06 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

7 PM
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.09 µg/m³
  • PM10: 25.72 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

8 PM
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.2 µg/m³
  • PM10: 26.04 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

9 PM
47 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.1 µg/m³
  • PM10: 25.75 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

10 PM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.84 µg/m³
  • PM10: 25.11 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

11 PM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.49 µg/m³
  • PM10: 24.26 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Tustin

Air Quality Alert

Air Quality Alert issued May 19 at 11:05PM PDT by NWS San Diego CA
May 19, 11:05 PM May 20, 4:30 PM
Updated: May 20, 3:08 PM Source: NWS Alert