Today | Weather | Saturday, August 29, 2026

Weather in Boulder, Colorado

12:20 PM
Now
Cloudy Weather
88° F
Feels Like 91°
Precipitation 1 %
Wind 7 mph
UV Index (0 - 11+) 6
Humidity 23 %
Today
Sunny with a Chance of Thunderstorms
Day 88°
Night 64°
Precipitation 55 %
Wind 6 mph
UV Index (0 - 11+) 6

Boulder Weather Forecast Updated

53 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (August 29, 2025)
Rainy Night

Day

82°

Night

57°

Wind

5 mph

Precipitation

55 %

Air Quality in Boulder

NOW
34 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.12 µg/m³
PM10 4.79 µg/m³
O3 0.037 ppm
NO2 0.1 ppb
SO2 0 ppb
CO 0.06 ppm
NH3 0.43 µg/m³
NO 0.02 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)
PM2.52.12 µg/m³
PM104.79 µg/m³
O372.12 µg/m³
NO20.18 µg/m³
SO20.07 µg/m³
CO64.67 µg/m³
NH30.43 µg/m³
NO0.02 µg/m³