UV Index
UV Index
Today's UV index in Dayton, United States 
will be up to 9.9, indicating a very 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: 2025-06-22
With a UV index of 9.9 in Dayton, it's crucial to safeguard your skin from harmful UV rays. Protect yourself by minimizing sun exposure, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours.
Dayton's UV index varies throughout the year, usually ranging from low in winter months to moderate or high during summer. UV levels peak around midday in the warmer seasons, especially late spring through early fall.
Dayton experiences four seasons: cold winters with snow, warm and humid summers, mild springs, and cool autumns. Spring and fall often bring rain, while summer can have thunderstorms. Winter temperatures frequently drop below freezing.
Compared to nearby cities, Dayton has similar weather to other parts of Ohio, with more snow than southern states like Kentucky. It's cooler and wetter than places farther south but less extreme than northern states like Michigan.
See the UV index hour by hour for Dayton, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.