Hourly Weather | Today Tuesday, January 13, 2026
Costa Mesa, California
3 PM
Sunny Weather
73°
Feels Like 72°
0
Humidity: 33%
Wind: 16 mph
UV Index: 2
4 PM
Sunny Weather
72°
Feels Like 68°
0
Humidity: 38%
Wind: 16 mph
UV Index: 1
5 PM
Sunny Weather
68°
Feels Like 64°
0
Humidity: 44%
Wind: 16 mph
UV Index: 0
6 PM
Night
64°
Feels Like 59°
0
Humidity: 56%
Wind: 15 mph
UV Index: 0
7 PM
Night
61°
Feels Like 61°
0
Humidity: 66%
Wind: 5 mph
UV Index: 0
8 PM
Night
57°
Feels Like 57°
0
Humidity: 72%
Wind: 4 mph
UV Index: 0
9 PM
Night
55°
Feels Like 55°
0
Humidity: 78%
Wind: 4 mph
UV Index: 0
10 PM
Night
52°
Feels Like 54°
0
Humidity: 83%
Wind: 4 mph
UV Index: 0
11 PM
Night
52°
Feels Like 52°
0
Humidity: 84%
Wind: 4 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

3 PM
148 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 54.49 µg/m³
  • PM10: 68.4 µg/m³
  • O3: 0.072 ppm
  • NO2: 10.4 ppb
  • SO2: 0.9 ppb
  • CO: 0.42 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

4 PM
151 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 57.97 µg/m³
  • PM10: 72.45 µg/m³
  • O3: 0.075 ppm
  • NO2: 11.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.43 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

5 PM
152 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 58.71 µg/m³
  • PM10: 73.62 µg/m³
  • O3: 0.073 ppm
  • NO2: 13 ppb
  • SO2: 1 ppb
  • CO: 0.43 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

6 PM
151 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 57.59 µg/m³
  • PM10: 72.45 µg/m³
  • O3: 0.069 ppm
  • NO2: 11.2 ppb
  • SO2: 1 ppb
  • CO: 0.43 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

7 PM
150 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 55.4 µg/m³
  • PM10: 69.81 µg/m³
  • O3: 0.065 ppm
  • NO2: 8.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.42 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

8 PM
143 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 52.42 µg/m³
  • PM10: 66.21 µg/m³
  • O3: 0.061 ppm
  • NO2: 6.1 ppb
  • SO2: 0.9 ppb
  • CO: 0.40 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

9 PM
133 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 48.61 µg/m³
  • PM10: 61.76 µg/m³
  • O3: 0.058 ppm
  • NO2: 4.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.38 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

10 PM
121 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 43.74 µg/m³
  • PM10: 56.11 µg/m³
  • O3: 0.055 ppm
  • NO2: 3.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.35 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

11 PM
106 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 37.89 µg/m³
  • PM10: 49.22 µg/m³
  • O3: 0.053 ppm
  • NO2: 2.6 ppb
  • SO2: 1 ppb
  • CO: 0.32 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.