Hourly Weather | Today Monday, April 27, 2026
Costa Mesa, California
8 PM
Cloudy Night
61°
Feels Like 57°
0
Humidity: 71%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Night
61°
Feels Like 57°
0
Humidity: 69%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Night
59°
Feels Like 57°
0
Humidity: 72%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
59°
Feels Like 57°
0
Humidity: 74%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

8 PM
84 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.45 µg/m³
  • PM10: 3.86 µg/m³
  • O3: 0.065 ppm
  • NO2: 0.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

9 PM
83 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.51 µg/m³
  • PM10: 4.22 µg/m³
  • O3: 0.065 ppm
  • NO2: 0.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

10 PM
82 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.57 µg/m³
  • PM10: 4.53 µg/m³
  • O3: 0.064 ppm
  • NO2: 0.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

11 PM
81 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.62 µg/m³
  • PM10: 4.78 µg/m³
  • O3: 0.064 ppm
  • NO2: 0.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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