Today | Weather | Saturday, September 19, 2026

Weather in Ann Arbor, Michigan

04:47 AM
Now
Rainy Weather
57° F
Feels Like 54°
Precipitation 72 %
Wind 5 mph
Humidity 81 %
Today
Rainy Weather
Day 63°
Night 61°
Precipitation 95 %
Wind 8 mph
UV Index (0 - 11+) 1

Ann Arbor Weather Forecast Updated

1 minute ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 19, 2025)
Night

Day

81°

Night

57°

Wind

6 mph

Precipitation

7 %

Air Quality in Ann Arbor

NOW
26 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.47 µg/m³
PM10 5.37 µg/m³
O3 0.028 ppm
NO2 2.6 ppb
SO2 0.7 ppb
CO 0.15 ppm
NH3 0.76 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)
PM2.54.47 µg/m³
PM105.37 µg/m³
O354.7 µg/m³
NO24.88 µg/m³
SO21.81 µg/m³
CO170.8 µg/m³
NH30.76 µg/m³
NO0 µg/m³