Today | Weather | Thursday, April 30, 2026

Weather in Fontana, California

03:13 PM
Now
Cloudy Weather
77° F
Feels Like 81°
Precipitation 0 %
Wind 12 mph
UV Index (0 - 11+) 7
Humidity 37 %
Today
Cloudy Weather
Day 77°
Night 55°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

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 30, 2025)
Cloudy Weather

Day

77°

Night

52°

Wind

7 mph

UV Index

9

Precipitation

40 %

Air Quality in Fontana

NOW
60 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 8.68 µg/m³
PM10 23.4 µg/m³
O3 0.057 ppm
NO2 0.1 ppb
SO2 0.4 ppb
CO 0.12 ppm
NH3 0.01 µg/m³
NO 0.05 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)
PM2.58.68 µg/m³
PM1023.4 µg/m³
O3112.52 µg/m³
NO20.26 µg/m³
SO21.16 µg/m³
CO134.28 µg/m³
NH30.01 µg/m³
NO0.05 µg/m³