Today | Weather | Sunday, November 9, 2025

Weather in Fullerton, California

09:34 AM
Now
Cloudy Weather
73° F
Feels Like 75°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 3
Humidity 38 %
Today
Cloudy Weather
Day 88°
Night 55°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 4

Fullerton Weather Forecast Updated

46 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (November 9, 2024)
Cloudy Night

Day

75°

Night

46°

Wind

4 mph

Precipitation

0 %

Air Quality in Fullerton

NOW
48 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 11.6 µg/m³
PM10 18.73 µg/m³
O3 0.046 ppm
NO2 0.3 ppb
SO2 0.3 ppb
CO 0.11 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.511.6 µg/m³
PM1018.73 µg/m³
O389.41 µg/m³
NO20.58 µg/m³
SO20.68 µg/m³
CO129.61 µg/m³
NH30.01 µg/m³
NO0.08 µg/m³