Today | Weather | Sunday, December 14, 2025

Weather in Thornton, Colorado

06:05 AM
Now
Cloudy Night
28° F
Feels Like 25°
Precipitation 0 %
Wind 6 mph
Humidity 70 %
Today
Cloudy Weather
Day 61°
Night 37°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 2

Thornton Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 14, 2024)
Cloudy Night

Day

57°

Night

32°

Wind

7 mph

Precipitation

49 %

Air Quality in Thornton

NOW
24 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.62 µg/m³
PM10 1.74 µg/m³
O3 0.026 ppm
NO2 1.7 ppb
SO2 0 ppb
CO 0.09 ppm
NH3 0.28 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)
PM2.51.62 µg/m³
PM101.74 µg/m³
O350.39 µg/m³
NO23.25 µg/m³
SO20.08 µg/m³
CO103.92 µg/m³
NH30.28 µg/m³
NO0 µg/m³