Today | Weather | Tuesday, September 22, 2026

Weather in Fontana, California

08:42 PM
Now
Night
72° F
Feels Like 70°
Precipitation 0 %
Wind 5 mph
Humidity 62 %
Today
Night
Day 82°
Night 63°
Precipitation 0 %
Wind 5 mph

Fontana Weather Forecast Updated

13 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 22, 2025)
Cloudy Night

Day

90°

Night

68°

Wind

4 mph

Precipitation

25 %

Air Quality in Fontana

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.93 µg/m³
PM10 12.93 µg/m³
O3 0.049 ppm
NO2 0.5 ppb
SO2 0.3 ppb
CO 0.10 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)
PM2.53.93 µg/m³
PM1012.93 µg/m³
O396.21 µg/m³
NO20.98 µg/m³
SO20.9 µg/m³
CO118.18 µg/m³
NH30 µg/m³
NO0 µg/m³