UV Index in Somerville, United States

Last updated: May 3, 2025

Understanding the UV Index in Somerville, United States, is essential for safeguarding your skin health and preventing sunburn. As a city known for its vibrant climate, Somerville experiences varying levels of UV exposure, particularly during peak hours when the index can soar to 10. With a climate classified as Cfa, which means humid subtropical conditions, residents must be aware of the heightened risks associated with UV radiation. By monitoring UV levels, you can take proactive measures to protect yourself and your loved ones from harmful effects, ensuring that outdoor activities can be both enjoyable and safe.

Hourly UV Index in Somerville

The UV Index data reveals a dynamic shift throughout the day, starting at a moderate 1 at 07:00 and gradually escalating. By 10:00, it peaks at a striking 7, but the real intensity sets in just a couple of hours later, reaching a maximum of 10 at both 12:00 and 13:00. This level indicates a high risk of harm from unprotected sun exposure. As the afternoon progresses, the index gradually declines, falling to 7 by 15:00, and tapering off to a mild 3 by 17:00. By the evening hours, it drops back to a benign 1, signaling a welcome reduction in UV intensity. Remember, during the peak hours, particularly between 10:00 and 13:00, it's crucial to protect your skin from harmful rays!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
TimeUVICategoryTime to Burn
07:001low45 min
08:002low45 min
09:004moderate30 min
10:007high25 min
11:009very high15 min
12:0010very high15 min
13:0010very high15 min
14:0010very high15 min
15:007high25 min
16:005moderate30 min
17:003moderate30 min
18:001low45 min
19:001low45 min

Monthly UV Index Trends in Somerville

As the seasons change, so do the UV levels, significantly impacting exposure for both residents and visitors. From January to April, the UV Index steadily increases from a moderate level of 4 in January to a very high level of 10 in April, indicating a critical period for sun safety as March and April experience burn times of just 15 minutes. May and June maintain extreme UV conditions with an index peaking at 11, resulting in a mere 10-minute burn time—the highest risk months of the year. July continues with similar extremes before a gradual decline starts in August, with the index at 10. The fall months, September and October, still present very high UV levels (up to 9), but burn times increase back to 15-25 minutes. By November and December, exposure returns to moderate levels of 4-6 with longer burn times of 25-30 minutes. Visitors and residents should take proper precautions from March through August, wearing sunscreen, protective clothing, and seeking shade during peak sunlight to minimize the risk of skin damage.

Monthly Maximum UV Index for Somerville, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Somerville. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109764
Data source: Statistical UV Index data for Somerville, based on information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

Compare Somerville UV Index with Other United States Cities

The table above highlights how UV exposure in Somerville compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.
Somerville's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Chicago UVI34689101098642
Brooklyn UVI35681010998642
New York City UVI35681010998642
Los Angeles UVI46891011111010754
Somerville46810101111109764
Houston UVI589111112121110975