Today | Weather | Sunday, November 1, 2026

Weather in Helena, Montana

09:34 PM
Now
Cloudy Weather
41° F
Feels Like 34°
Precipitation 33 %
Wind 9 mph
Humidity 93 %
Today
Rainy Weather
Day 45°
Night 37°
Precipitation 99 %
Wind 6 mph
UV Index (0 - 11+) 1

Helena Weather Forecast Updated

Air Quality in Helena

NOW
27 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.56 µg/m³
PM10 0.57 µg/m³
O3 0.030 ppm
NO2 1.1 ppb
SO2 0 ppb
CO 0.12 ppm
NH3 0.08 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 – 0.56 µg/m³
PM10 – 0.57 µg/m³
O3 – 57.97 µg/m³
NO2 – 1.99 µg/m³
SO2 – 0 µg/m³
CO – 139.02 µg/m³
NH3 – 0.08 µg/m³
NO – 0 µg/m³