Today | Weather | Tuesday, January 13, 2026

Weather in Boulder, Colorado

01:26 PM
Now
Cloudy Weather
59° F
Feels Like 57°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 2
Humidity 27 %
Today
Cloudy Weather
Day 59°
Night 36°
Precipitation 1 %
Wind 7 mph
UV Index (0 - 11+) 2

Boulder Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (January 13, 2025)
Cloudy Weather

Day

39°

Night

21°

Wind

8 mph

UV Index

3

Precipitation

3 %

Air Quality in Boulder

NOW
33 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.06 µg/m³
PM10 1.13 µg/m³
O3 0.035 ppm
NO2 0.6 ppb
SO2 0.5 ppb
CO 0.08 ppm
NH3 0.07 µg/m³
NO 0.43 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)
PM2.51.06 µg/m³
PM101.13 µg/m³
O369.63 µg/m³
NO21.13 µg/m³
SO21.18 µg/m³
CO90.64 µg/m³
NH30.07 µg/m³
NO0.43 µg/m³