Today | Weather | Monday, July 20, 2026

Weather in Fontana, California

02:21 PM
Now
Cloudy Weather
93° F
Feels Like 97°
Precipitation 25 %
Wind 9 mph
UV Index (0 - 11+) 5
Humidity 24 %
Today
Cloudy Weather
Day 97°
Night 70°
Precipitation 49 %
Wind 7 mph
UV Index (0 - 11+) 6

Fontana Weather Forecast Updated

56 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 20, 2025)
Cloudy Night

Day

86°

Night

61°

Wind

6 mph

Precipitation

1 %

Air Quality in Fontana

NOW
34 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.99 µg/m³
PM10 13.6 µg/m³
O3 0.037 ppm
NO2 0.1 ppb
SO2 0.3 ppb
CO 0.08 ppm
NH3 0 µg/m³
NO 0.06 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)
PM2.54.99 µg/m³
PM1013.6 µg/m³
O371.81 µg/m³
NO20.24 µg/m³
SO20.75 µg/m³
CO86.22 µg/m³
NH30 µg/m³
NO0.06 µg/m³