UV Index
UV Index
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Today's UV index in Boston, United States 
will be up to 1.1, indicating low risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
Today, the UV index suggests low sun danger (0-2) in Boston, reaching up to 1.1. Remember sunglasses and SPF 30+ on sunny days, and be cautious around reflective surfaces like sand, water, and snow for increased UV exposure.
Read more here about the climate and sun exposure in and around Boston.
In Boston, the UV index varies throughout the year. During the summer months, the index can reach high levels, especially between 10 am and 4 pm. It is important to protect your skin from the sun's harmful rays by wearing sunscreen, hats, and sunglasses. The index typically drops during the colder months but can still cause sunburn, so it's always a good idea to be mindful of sun protection.
Boston experiences four distinct weather seasons. Spring (March to May) brings mild temperatures, with averages ranging from 5 °C (41 °F) to 15 °C (59 °F). Summer (June to August) is generally warm and humid, with temperatures ranging from 20 °C (68 °F) to 30 °C (86 °F). Fall (September to November) brings cooler temperatures, ranging from 10 °C (50 °F) to 20 °C (68 °F), and vibrant foliage. Winter (December to February) is cold, with average temperatures between -6 °C (21 °F) and 5 °C (41 °F), and snowfall is common.
Compared to its region, Boston experiences greater sun exposure due to its latitude. It receives an average of 3,114 hours of sunshine per year, which is slightly higher than the regional average. Cities along the east coast of the United States generally receive a similar amount of sunshine, but Boston's position slightly to the north allows for longer daylight hours during the summer months. It is important to consider this when planning outdoor activities and sun protection measures.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Boston. It's designed to provide you with a better understanding of the yearly weather and sun exposure.