Hourly Weather | Today Tuesday, June 9, 2026
Active Weather Warnings
Costa Mesa, California
5 PM
Cloudy Weather
73°
Feels Like 75°
0
Humidity: 63%
UV Index: 3
Wind: 8 mph
6 PM
Cloudy Weather
72°
Feels Like 72°
0
Humidity: 67%
UV Index: 2
Wind: 8 mph
7 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 70%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Weather
68°
Feels Like 66°
0
Humidity: 75%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
66°
Feels Like 64°
0
Humidity: 81%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
64°
Feels Like 63°
0
Humidity: 84%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
64°
Feels Like 64°
0
Humidity: 86%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 5.78 µg/m³
  • PM10: 15.76 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.93 µg/m³
  • PM10: 16.19 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.98 µg/m³
  • PM10: 16.49 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.19 µg/m³
  • PM10: 17.26 µg/m³
  • O3: 0.035 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.61 µg/m³
  • PM10: 18.57 µg/m³
  • O3: 0.034 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.05 µg/m³
  • PM10: 19.85 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

11 PM
30 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.28 µg/m³
  • PM10: 20.57 µg/m³
  • O3: 0.032 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Costa Mesa

Moderate Expected Likely

Beach Hazards Statement

Beach Hazards Statement issued June 9 at 12:39PM PDT until June 11 at 5:00PM PDT by NWS San Diego CA
Jun 9, 12:39 PM Jun 11, 5:00 PM
WHAT: South swell from 190 degrees with a period of 18 to 20
seconds will generate surf of 4 to 7 feet with sets up to 9
feet along south-facing beaches. High rip current risk.

WHERE: San Diego County Coastal Areas and Orange County
Coastal Areas.

WHEN: From late Monday night through Thursday afternoon.

IMPACTS: Hazardous swimming conditions and a high rip current
risk. If you become caught in a rip current, yell for help.
Remain calm and do not exhaust yourself and stay afloat while
waiting for help. If you have to swim out of a rip current,
SWIM PARALLEL TO SHORE and back toward the beach when
possible. Do not attempt to swim directly against a rip
current as you will tire quickly.

ADDITIONAL DETAILS: Highest surf will be at south-facing
beaches and peak Tuesday and Wednesday. Swell and surf will
slowly subside beginning Thursday with a shorter period, but
will remain elevated into Friday.
+ Read More
Remain out of the water to avoid hazardous swimming conditions.
Updated: Jun 9, 4:29 PM Source: NWS Alert