Today | Weather | Saturday, November 1, 2025

Weather in Longmont, Colorado

11:08 AM

Now

43° F

Feels Like 43°

Precipitation 0 %

Wind 7 mph

UV Index (0 - 11+) 3

Humidity 53 %

Today

Day 66°

Night 39°

Precipitation 0 %

Wind 6 mph

UV Index (0 - 11+) 3

Longmont Weather Forecast Updated

22 minutes ago

Last updated on November 01, 2025 10:45 AM

Weather Forecast History

Last Year's Weather on This Day (November 1, 2024)

Day

57°

Night

28°

Wind

4 mph

Precipitation

Air Quality in Longmont

NOW

37 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 1.06 µg/m³

PM₁₀ 1.42 µg/m³

O₃ 0.040 ppm

NO₂ 0.5 ppb

SO₂ 0.3 ppb

CO 0.07 ppm

NH₃ 0.2 µg/m³

NO 0.32 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 – 1.06 µg/m³

PM₁₀ – 1.42 µg/m³

O₃ – 78.74 µg/m³

NO₂ – 0.89 µg/m³

SO₂ – 0.69 µg/m³

CO – 83.25 µg/m³

NH₃ – 0.2 µg/m³

NO – 0.32 µg/m³

View Hourly Air Quality Forecast