Today | Weather | Tuesday, November 4, 2025

Weather in Thornton, Colorado

03:16 AM

Now

39° F

Feels Like 34°

Precipitation 0 %

Wind 8 mph

Humidity 62 %

Today

Day 75°

Night 37°

Precipitation 0 %

Wind 7 mph

UV Index (0 - 11+) 3

Thornton Weather Forecast Updated

Last updated on November 04, 2025 1:30 AM

Weather Forecast History

Last Year's Weather on This Day (November 4, 2024)

Day

43°

Night

28°

Wind

6 mph

Precipitation

Air Quality in Thornton

NOW

20 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 1.88 µg/m³

PM₁₀ 2.26 µg/m³

O₃ 0.022 ppm

NO₂ 1.4 ppb

SO₂ 0 ppb

CO 0.09 ppm

NH₃ 0.28 µg/m³

NO 0 µg/m³

PM_2.5 – 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)

PM_2.5 – 1.88 µg/m³

PM₁₀ – 2.26 µg/m³

O₃ – 42.73 µg/m³

NO₂ – 2.66 µg/m³

SO₂ – 0.11 µg/m³

CO – 98.42 µg/m³

NH₃ – 0.28 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast