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UV Index in Boston

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Today's UV index in Boston, United States United States will be up to 7.3, 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.


Today's tips

With Boston's UV index reaching 7.3, 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.

Boston's UV Index

The UV index in Boston can reach high levels during the summer, with a peak in July. However, the city experiences lower UV index levels in the fall and winter months. On average, Boston has about 205 sunny days per year.

Weather Seasons

UV index

Boston has four distinct seasons: a mild spring, a hot and humid summer, a crisp and colorful fall, and a cold and snowy winter. The city's coastal location helps to moderate temperatures year-round, but can also lead to rainy and foggy conditions.

Boston's Climate

Compared to its region and neighboring countries, Boston has a milder climate. The city is situated further south than cities such as Montreal and Toronto, and experiences less extreme temperatures than inland areas of the United States and Canada. The Atlantic Ocean also helps to moderate Boston's climate, keeping it milder than inland cities in the same latitude.

Annual Sun Radiation

The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Boston. It's designed to provide you with a better understanding of the yearly weather and sun exposure.


* This page's content about the UV index in Boston (United States) is for educational and informational purposes only. The developers and data providers are not liable for the accuracy, reliability, or availability of the information. The information is not a substitute for professional medical advice, and the developers and data providers are not medical professionals. Seek advice from a qualified health provider for any medical concerns, and do not disregard medical advice or delay seeking it based on the information provided on this site.