UV Index
UV Index
Today's UV index in Frederick, United States 
will be up to 7.8, 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: 2025-06-01
With Frederick's UV index reaching 7.8, 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.
Frederick, United States, has a UV index that ranges from low to high depending on the season, with higher values in the summer months, often reaching levels that can cause sunburn quickly. Seasons in Frederick include cold winters with occasional snow, warm and humid summers, and mild spring and autumn with changing foliage colors. Compared to nearby cities like Washington D.C., Frederick tends to be slightly cooler and less humid, while its weather is similar to other parts of Maryland and the Mid-Atlantic region.
See the UV index hour by hour for Frederick, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.