Today | Weather | Saturday, November 14, 2026

Weather in Ontario, California

03:47 PM
Now
Cloudy Weather
68° F
Feels Like 66°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 1
Humidity 52 %
Today
Cloudy Weather
Day 70°
Night 50°
Precipitation 22 %
Wind 5 mph
UV Index (0 - 11+) 3

Ontario Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (November 14, 2025)
Rainy Weather

Day

63°

Night

59°

Wind

5 mph

Precipitation

100 %

Air Quality in Ontario

NOW
48 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.25 µg/m³
PM10 3.11 µg/m³
O3 0.051 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.10 ppm
NH3 0 µg/m³
NO 0.01 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)
PM2.5 – 1.25 µg/m³
PM10 – 3.11 µg/m³
O3 – 101.08 µg/m³
NO2 – 0.28 µg/m³
SO2 – 0.2 µg/m³
CO – 118.92 µg/m³
NH3 – 0 µg/m³
NO – 0.01 µg/m³