Today | Weather | Thursday, June 25, 2026

Weather in Ontario, California

09:49 PM
Now
Cloudy Night
66° F
Feels Like 64°
Precipitation 0 %
Wind 8 mph
Humidity 68 %
Today
Cloudy Night
Day 82°
Night 57°
Precipitation 1 %
Wind 7 mph

Ontario Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (June 25, 2025)
Cloudy Weather

Day

86°

Night

61°

Wind

7 mph

UV Index

12

Precipitation

25 %

Air Quality in Ontario

NOW
40 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.69 µg/m³
PM10 6.34 µg/m³
O3 0.043 ppm
NO2 0.3 ppb
SO2 0.2 ppb
CO 0.07 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)
PM2.52.69 µg/m³
PM106.34 µg/m³
O385.15 µg/m³
NO20.48 µg/m³
SO20.57 µg/m³
CO81.92 µg/m³
NH30 µg/m³
NO0 µg/m³