UV Index
UV Index
Today's UV index in Princeton, United States 
will be up to 8.1, 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: 2025-07-22
With a UV index of 8.1 in Princeton, 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.
The UV index in Princeton usually ranges from low to moderate during winter and spring and can reach high levels during summer days, especially around noon when the sun is strongest.
Princeton experiences four seasons: cold, snowy winters; warm, humid summers; and mild, pleasant springs and autumns with changing leaf colors. Seasonal changes bring varying temperatures and precipitation patterns.
Compared to nearby cities like New York and Philadelphia, Princeton has similar weather but often slightly less urban heat. It shares a humid continental climate with most of the northeastern United States, with cold winters and warm summers.
See the UV index hour by hour for Princeton, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.