Today | Weather | Friday, October 3, 2025

Weather in Ontario, California

06:00 AM

Now

61° F

Feels Like 61°

Precipitation 0 %

Wind 5 mph

Humidity 96 %

Today

Day 75°

Night 54°

Precipitation 25 %

Wind 10 mph

UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Ontario Weather Forecast Updated

59 minutes ago

Last updated on October 03, 2025 5:01 AM

Weather Forecast History

Last Year's Weather on This Day (October 3, 2024)

Day

93°

Night

64°

Wind

4 mph

Precipitation

Air quality in Ontario

NOW

64 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 27.49 µg/m³

PM10 28.20 µg/m³

O₃ 11.38 ppb

NO₂ 21.93 ppb

SO₂ 5.69 ppb

CO 246.86 ppb

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

Health Recommendations:

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

View Hourly Air Quality Forecast