Today | Weather | Tuesday, April 21, 2026

Weather in Mission Viejo, California

05:19 PM
Now
Partly Sunny with Showers
64° F
Feels Like 61°
Precipitation 55 %
Wind 9 mph
UV Index (0 - 11+) 1
Humidity 73 %
Today
Partly Sunny with Showers
Day 68°
Night 54°
Precipitation 55 %
Wind 8 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Mission Viejo Weather Forecast Updated

Last updated on

Air Quality in Mission Viejo

NOW
42 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.79 µg/m³
PM10 3.58 µg/m³
O3 0.045 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.11 ppm
NH3 0 µg/m³
NO 0.01 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

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

Show raw pollutant concentrations (µg/m³)
PM2.51.79 µg/m³
PM103.58 µg/m³
O388.34 µg/m³
NO20.1 µg/m³
SO20.23 µg/m³
CO121.16 µg/m³
NH30 µg/m³
NO0.01 µg/m³