Today | Weather | Wednesday, March 18, 2026

Weather in Ann Arbor, Michigan

06:43 AM
Now
Cloudy Weather
21° F
Feels Like 14°
Precipitation 2 %
Wind 7 mph
Humidity 55 %
Today
Snowy Weather
Day 36°
Night 28°
Precipitation 55 %
Wind 13 mph
UV Index (0 - 11+) 1
Overnight Frost 2 AM – 9 AM
Tomorrow Morning Frost 2 AM – 3 AM

Ann Arbor Weather Forecast Updated

33 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 18, 2025)
Cloudy Weather

Day

68°

Night

50°

Wind

12 mph

UV Index

5

Precipitation

0 %

Air Quality in Ann Arbor

NOW
43 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.52 µg/m³
PM10 3.84 µg/m³
O3 0.047 ppm
NO2 1.3 ppb
SO2 0.4 ppb
CO 0.15 ppm
NH3 2.32 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)
PM2.52.52 µg/m³
PM103.84 µg/m³
O392.05 µg/m³
NO22.38 µg/m³
SO20.97 µg/m³
CO168.06 µg/m³
NH32.32 µg/m³
NO0 µg/m³