Today | Weather | Sunday, October 25, 2026

Weather in Santa Ana, California

08:40 AM
Now
Cloudy Weather
64° F
Feels Like 66°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 1
Humidity 73 %
Today
Cloudy Weather
Day 82°
Night 57°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 4

Santa Ana Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 25, 2025)
Cloudy Night

Day

73°

Night

55°

Wind

4 mph

Precipitation

0 %

Air Quality in Santa Ana

NOW
44 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 8.41 µg/m³
PM10 15.47 µg/m³
O3 0.047 ppm
NO2 0.3 ppb
SO2 0.2 ppb
CO 0.14 ppm
NH3 0.01 µg/m³
NO 0.04 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)
PM2.5 – 8.41 µg/m³
PM10 – 15.47 µg/m³
O3 – 93.09 µg/m³
NO2 – 0.61 µg/m³
SO2 – 0.51 µg/m³
CO – 155.91 µg/m³
NH3 – 0.01 µg/m³
NO – 0.04 µg/m³