Today | Weather | Thursday, February 26, 2026

Active Weather Warnings

Fire Weather Watch

Weather in Thornton, Colorado

10:03 AM

Now

55° F

Feels Like 52°

Precipitation 20 %

Wind 15 mph

UV Index (0 - 11+) 3

Humidity 27 %

Today

Day 63°

Night 36°

Precipitation 25 %

Wind 15 mph

UV Index (0 - 11+) 4

Thornton Weather Forecast Updated

9 minutes ago

Last updated on February 26, 2026 at 9:54 AM

Weather Forecast History

Last Year's Weather on This Day (February 26, 2025)

Day

50°

Night

25°

Wind

7 mph

UV Index

Precipitation

1 %

Air Quality in Thornton

NOW

35 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 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

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 – 0.5 µg/m³

PM₁₀ – 0.5 µg/m³

O₃ – 73.22 µg/m³

NO₂ – 0.25 µg/m³

SO₂ – 0.17 µg/m³

CO – 94.75 µg/m³

NH₃ – 0.07 µg/m³

NO – 0.08 µg/m³

View Hourly Air Quality Forecast

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The Fire Weather Watch has been cancelled and is no longer in effect.

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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