Today | Weather | Saturday, October 24, 2026

Weather in Fullerton, California

01:39 PM
Now
Cloudy Weather
79° F
Feels Like 82°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 4
Humidity 38 %
Today
Sunny Weather
Day 81°
Night 55°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 4

Fullerton Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 24, 2025)
Cloudy Night

Day

77°

Night

57°

Wind

4 mph

Precipitation

0 %

Air Quality in Fullerton

NOW
77 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 13.32 µg/m³
PM10 17.43 µg/m³
O3 0.063 ppm
NO2 0.4 ppb
SO2 0.9 ppb
CO 0.16 ppm
NH3 0.01 µg/m³
NO 0.08 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.5 – 13.32 µg/m³
PM10 – 17.43 µg/m³
O3 – 122.74 µg/m³
NO2 – 0.67 µg/m³
SO2 – 2.48 µg/m³
CO – 179.74 µg/m³
NH3 – 0.01 µg/m³
NO – 0.08 µg/m³