Today | Weather | Saturday, August 23, 2025

Heat Advisory (Issued when high temperatures and humidity create conditions that may be hazardous during outdoor activity or prolonged exposure.)

Weather in Ontario, California

07:21 PM

Now

93° F

Feels Like 91°

Precipitation 44 %

Wind 8 mph

UV Index (0 - 11+) 3

Humidity 29 %

Today

Day 99°

Night 70°

Precipitation 40 %

Wind 4 mph

Ontario Weather Forecast Updated

15 minutes ago

Last updated on August 23, 2025 7:06 PM

Last Year's Weather on This Day (August 23, 2024)

86°

61°

7 mph

NOW

65 AQI

Moderate air quality Dominant pollutant: O3

PM2.5 20.72 µg/m³

PM10 22.66 µg/m³

O₃ 61.88 ppb

NO₂ 16.31 ppb

SO₂ 6.56 ppb

CO 206.57 ppb

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.