Today | Weather | Tuesday, May 12, 2026

Weather in Santa Ana, California

07:21 PM
Now
Cloudy Weather
70° F
Feels Like 68°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 1
Humidity 62 %
Today
Cloudy Weather
Day 72°
Night 59°
Precipitation 2 %
Wind 8 mph
UV Index (0 - 11+) 5

Santa Ana Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 12, 2025)
Cloudy Weather

Day

73°

Night

55°

Wind

12 mph

UV Index

11

Precipitation

1 %

Air Quality in Santa Ana

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.97 µg/m³
PM10 16.18 µg/m³
O3 0.048 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)
PM2.54.97 µg/m³
PM1016.18 µg/m³
O394.68 µg/m³
NO20.27 µg/m³
SO20.42 µg/m³
CO123.48 µg/m³
NH30 µg/m³
NO0 µg/m³