UV Index
UV Index
Today's UV index in Ann Arbor, United States 
will be up to 7.7, indicating a high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-09
With Ann Arbor's UV index reaching 7.7, protect your skin from harm by staying in shade, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours, especially between 10 a.m. and 4 p.m. when UV rays are strongest.
The UV index in Ann Arbor varies throughout the year, reaching its highest levels around 7 to 8 during summer months and dropping to 1 or 2 in the winter. Spring and fall have moderate UV levels around 3 to 5.
Ann Arbor experiences four distinct seasons. Winters are cold with snow, while summers are warm and sometimes humid. Spring brings mild temperatures and blooming plants, and fall features cooler air and colorful leaves.
Compared to the wider Midwest region, Ann Arbor has slightly milder winters than places further north but similar summer warmth. Neighboring states like Ohio and Indiana have comparable seasonal patterns and UV levels, with only minor differences in temperature.
See the UV index hour by hour for Ann Arbor, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.