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Today | Weather | Thursday, February 26, 2026
Active Weather Warnings

Weather in Boulder, Colorado

12:46 AM
Now
Cloudy Night
46° F
Feels Like 39°
Precipitation 0 %
Wind 13 mph
Humidity 33 %
Today
Windy Weather
Day 61°
Night 43°
Precipitation 9 %
Wind 17 mph
UV Index (0 - 11+) 4

Boulder Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (February 26, 2025)
Partly Sunny with Showers

Day

50°

Night

30°

Wind

4 mph

UV Index

4

Precipitation

49 %

Air Quality in Boulder

NOW
27 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.52 µg/m³
PM10 0.96 µg/m³
O3 0.029 ppm
NO2 0.4 ppb
SO2 0.1 ppb
CO 0.08 ppm
NH3 0.18 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)
PM2.5 – 0.52 µg/m³
PM10 – 0.96 µg/m³
O3 – 57.7 µg/m³
NO2 – 0.68 µg/m³
SO2 – 0.18 µg/m³
CO – 88.01 µg/m³
NH3 – 0.18 µg/m³
NO – 0 µg/m³
View Hourly Air Quality Forecast

Weather Alerts and Warnings for Boulder

Severe Future Possible

Fire Weather Watch

Fire Weather Watch issued February 25 at 6:08PM MST until February 26 at 5:00PM MST by NWS Denver CO
Feb 26, 11:00 AM → Feb 26, 5:00 PM
* AFFECTED AREA...Fire Weather Zones 238, 239, 240, 242, 243,
244, 245, 246, 248, 249, 250 and 251.

* TIMING...From Thursday morning through Thursday afternoon.

* WINDS...Northwest 15 to 25 mph with gusts up to 40 mph.

* RELATIVE HUMIDITY...As low as 14 percent.

IMPACTS: Conditions will be favorable for rapid fire spread.
Avoid outdoor burning and any activity that may produce a
spark and start a wildfire.
+ Read More
A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
Updated: Feb 25, 11:24 PM Source: NWS Alert