Today | Weather | Friday, September 18, 2026

Weather in Tucson, Arizona

10:39 PM
Now
Cloudy Night
79° F
Feels Like 75°
Precipitation 19 %
Wind 5 mph
Humidity 50 %
Today
Stormy Weather
Day 97°
Night 70°
Precipitation 55 %
Wind 5 mph

Tucson Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Stormy Weather

Day

97°

Night

70°

Wind

6 mph

Precipitation

80 %

Air Quality in Tucson

NOW
20 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.01 µg/m³
PM10 8.85 µg/m³
O3 0.022 ppm
NO2 1 ppb
SO2 0 ppb
CO 0.08 ppm
NH3 1.68 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)
PM2.52.01 µg/m³
PM108.85 µg/m³
O343.08 µg/m³
NO21.89 µg/m³
SO20.06 µg/m³
CO90.61 µg/m³
NH31.68 µg/m³
NO0 µg/m³