UV Index
UV Index
Today's UV index in Boston, United States 
will be up to 8.3, 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: 2025-06-21
With a UV index of 8.3 in Boston, 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.
Boston's UV index varies throughout the year, typically peaking around 7 to 8 in summer and dropping to 1 or 2 in winter. Spring and fall have moderate UV levels near 4 to 5.
Boston experiences four distinct seasons: cold, snowy winters; warm, sometimes humid summers; and brief, colorful springs and autumns with mild temperatures. Snowfall is common in winter, while spring and fall bring more rain.
Compared to the wider New England region, Boston tends to have milder coastal weather with less extreme cold than inland areas. Neighboring cities like New York City are warmer in winter, while Boston is colder and snowier due to its northern location.
See the UV index hour by hour for Boston, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.