Today | Weather | Wednesday, February 25, 2026

Weather in Fontana, California

11:48 PM
Now
Cloudy Night
57° F
Feels Like 57°
Precipitation 0 %
Wind 5 mph
Humidity 80 %
Today
Cloudy Weather
Day 84°
Night 59°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 5

Fontana Weather Forecast Updated

59 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (February 25, 2025)
Sunny Weather

Day

82°

Night

52°

Wind

6 mph

UV Index

5

Precipitation

0 %

Air Quality in Fontana

NOW
32 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.39 µg/m³
PM10 13.59 µg/m³
O3 0.034 ppm
NO2 2.8 ppb
SO2 0.3 ppb
CO 0.15 ppm
NH3 0.18 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)
PM2.56.39 µg/m³
PM1013.59 µg/m³
O367.41 µg/m³
NO25.21 µg/m³
SO20.9 µg/m³
CO169.98 µg/m³
NH30.18 µg/m³
NO0 µg/m³