UV Index
UV Index
Today's UV index in Philadelphia, United States 
will be up to 7.5, 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 Philadelphia's UV index reaching 7.5, 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.
Philadelphia's UV index generally ranges from low to high depending on the season, peaking in summer months around 8 to 10. Winter months often see a low UV index of 1 to 2.
In Philadelphia, summers are hot and humid with frequent thunderstorms, while winters are cold with occasional snow. Spring and fall are mild with variable weather and moderate rainfall. Seasonal changes are quite noticeable throughout the year.
Compared to the wider Mid-Atlantic region, Philadelphia has similar weather patterns but can experience more urban heat effects. Neighboring states like New Jersey and Delaware share similar seasonal weather, while areas further north usually have colder winters.
See the UV index hour by hour for Philadelphia, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.