Today | Weather | Tuesday, April 7, 2026

Weather in Fontana, California

09:48 AM
Now
Cloudy Weather
70° F
Feels Like 73°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 4
Humidity 48 %
Today
Cloudy Weather
Day 82°
Night 57°
Precipitation 1 %
Wind 8 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Fontana Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 7, 2025)
Cloudy Weather

Day

82°

Night

52°

Wind

6 mph

UV Index

8

Precipitation

1 %

Air Quality in Fontana

NOW
46 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 7.75 µg/m³
PM10 21.72 µg/m³
O3 0.050 ppm
NO2 0.5 ppb
SO2 0.6 ppb
CO 0.12 ppm
NH3 0 µg/m³
NO 0.16 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)
PM2.57.75 µg/m³
PM1021.72 µg/m³
O397.84 µg/m³
NO21.02 µg/m³
SO21.45 µg/m³
CO137.26 µg/m³
NH30 µg/m³
NO0.16 µg/m³