Today | Weather | Monday, September 21, 2026

Weather in Irvine, California

03:12 AM
Now
Cloudy Weather
68° F
Feels Like 66°
Precipitation 40 %
Wind 4 mph
Humidity 83 %
Today
Cloudy Weather
Day 79°
Night 64°
Precipitation 6 %
Wind 7 mph
UV Index (0 - 11+) 6

Irvine Weather Forecast Updated

40 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Rainy Weather

Day

77°

Night

64°

Wind

4 mph

Precipitation

49 %

Air Quality in Irvine

NOW
49 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.38 µg/m³
PM10 13.71 µg/m³
O3 0.053 ppm
NO2 0.1 ppb
SO2 0.2 ppb
CO 0.11 ppm
NH3 0 µg/m³
NO 0 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)
PM2.54.38 µg/m³
PM1013.71 µg/m³
O3103.3 µg/m³
NO20.25 µg/m³
SO20.46 µg/m³
CO126.55 µg/m³
NH30 µg/m³
NO0 µg/m³