Today | Weather | Sunday, December 14, 2025

Weather in Boulder, Colorado

06:21 AM
Now
Cloudy Night
30° F
Feels Like 25°
Precipitation 0 %
Wind 7 mph
Humidity 62 %
Today
Cloudy Weather
Day 63°
Night 43°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 2

Boulder Weather Forecast Updated

28 seconds ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 14, 2024)
Rainy Night

Day

54°

Night

36°

Wind

7 mph

Precipitation

49 %

Air Quality in Boulder

NOW
26 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.34 µg/m³
PM10 1.44 µg/m³
O3 0.028 ppm
NO2 1 ppb
SO2 0 ppb
CO 0.08 ppm
NH3 0.19 µg/m³
NO 0 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)
PM2.51.34 µg/m³
PM101.44 µg/m³
O355.06 µg/m³
NO21.8 µg/m³
SO20.11 µg/m³
CO86.74 µg/m³
NH30.19 µg/m³
NO0 µg/m³