UV Index
UV Index
Today's UV index in Sayville, 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: 2025-07-12
With Sayville'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.
Sayville, United States, usually has a UV index that varies from low to high depending on the season, with higher levels in summer when the sun is strongest.
The weather in Sayville changes with the seasons. Summers are warm and sometimes humid, while winters are cold and can bring snow. Spring and fall have mild temperatures and are often pleasant.
Compared to nearby areas in the Northeastern U.S., Sayville's weather is similar, with coastal influences making it a bit milder in winter than inland places. It’s generally cooler and less humid than southern states.
See the UV index hour by hour for Sayville, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.