Today | Weather | Tuesday, April 7, 2026

Weather in Longmont, Colorado

12:21 PM
Now
Cloudy Weather
54° F
Feels Like 57°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 6
Humidity 38 %
Today
Partly Sunny with Showers
Day 72°
Night 45°
Precipitation 49 %
Wind 7 mph
UV Index (0 - 11+) 6

Longmont Weather Forecast Updated

9 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 7, 2025)
Sunny Weather

Day

70°

Night

41°

Wind

4 mph

UV Index

7

Precipitation

0 %

Air Quality in Longmont

NOW
41 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.79 µg/m³
PM10 3.71 µg/m³
O3 0.044 ppm
NO2 0.4 ppb
SO2 0.1 ppb
CO 0.10 ppm
NH3 2.12 µg/m³
NO 0.31 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)
PM2.52.79 µg/m³
PM103.71 µg/m³
O386.76 µg/m³
NO20.84 µg/m³
SO20.24 µg/m³
CO111.02 µg/m³
NH32.12 µg/m³
NO0.31 µg/m³