UV Index
UV Index
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Today's UV index in Philadelphia, United States 
will be up to 7, indicating a high level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
With Philadelphia's UV index reaching 7, protect your skin from harm by staying in shade, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours between 10 a.m. and 4 p.m., when UV rays are strongest.
The UV index in Philadelphia can reach a high of 9 during peak summer months, such as July and August. On average, the city experiences a UV index of 3.7, which is considered moderate.
Philadelphia has four distinct seasons, with hot, humid summers and cold, snowy winters. Spring and fall offer mild temperatures and changing leaves, making them popular times to visit.
Compared to its region and neighboring countries, Philadelphia has a more moderate climate. While still experiencing four seasons, the city sees milder winters than more northern areas like Canada, and less rainfall than countries such as England.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Philadelphia. It's designed to provide you with a better understanding of the yearly weather and sun exposure.