Today | Weather | Monday, September 29, 2025

Weather in Ann Arbor, Michigan

12:51 AM

Now

57° F

Feels Like 57°

Precipitation 0 %

Wind 5 mph

Humidity 90 %

Today

Day 82°

Night 52°

Precipitation 1 %

Wind 5 mph

UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Ann Arbor Weather Forecast Updated

Last updated on September 28, 2025 11:34 PM

Air quality in Ann Arbor

NOW

55 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 11.66 µg/m³

PM10 23.28 µg/m³

O₃ 21.91 ppb

NO₂ 17.17 ppb

SO₂ 1.37 ppb

CO 86.16 ppb

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

View Hourly Air Quality Forecast