Today | Weather | Thursday, February 26, 2026
Active Weather Warnings

Weather in Thornton, Colorado

10:03 AM
Now
Sunny Weather
55° F
Feels Like 52°
Precipitation 20 %
Wind 15 mph
UV Index (0 - 11+) 3
Humidity 27 %
Today
Cloudy Weather
Day 63°
Night 36°
Precipitation 25 %
Wind 15 mph
UV Index (0 - 11+) 4

Thornton Weather Forecast Updated

9 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (February 26, 2025)
Cloudy Weather

Day

50°

Night

25°

Wind

7 mph

UV Index

4

Precipitation

1 %

Air Quality in Thornton

NOW
35 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.5 µg/m³
PM10 0.5 µg/m³
O3 0.037 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.08 ppm
NH3 0.07 µg/m³
NO 0.08 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)
PM2.50.5 µg/m³
PM100.5 µg/m³
O373.22 µg/m³
NO20.25 µg/m³
SO20.17 µg/m³
CO94.75 µg/m³
NH30.07 µg/m³
NO0.08 µg/m³

Weather Alerts and Warnings for Thornton

Minor Past Observed

Fire Weather Watch

The Fire Weather Watch has been cancelled.
Feb 26, 11:00 AM Feb 26, 5:00 PM
The Fire Weather Watch has been cancelled and is no longer in effect.
+ Read More
A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
Updated: Feb 26, 9:54 AM Source: NWS Alert