Today | Weather | Thursday, January 1, 2026

Weather in Longmont, Colorado

03:03 PM
Now
Rainy Weather
55° F
Feels Like 52°
Precipitation 47 %
Wind 7 mph
UV Index (0 - 11+) 0
Humidity 32 %
Today
Rainy Weather
Day 57°
Night 39°
Precipitation 55 %
Wind 5 mph
UV Index (0 - 11+) 1

Longmont Weather Forecast Updated

8 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (January 1, 2025)
Cloudy Weather

Day

39°

Night

21°

Wind

4 mph

UV Index

2

Precipitation

8 %

Air Quality in Longmont

NOW
30 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.11 µg/m³
PM10 1.15 µg/m³
O3 0.032 ppm
NO2 0.7 ppb
SO2 0 ppb
CO 0.09 ppm
NH3 0.08 µg/m³
NO 0.17 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)
PM2.51.11 µg/m³
PM101.15 µg/m³
O363.69 µg/m³
NO21.33 µg/m³
SO20.05 µg/m³
CO99.95 µg/m³
NH30.08 µg/m³
NO0.17 µg/m³