UV Index in Hyannis, United States

Last updated: July 2, 2025

Understanding the UV Index in Hyannis is crucial for protecting your skin and overall health from harmful ultraviolet radiation. With the highest UV levels peaking at a severe 11 around midday, being aware of these fluctuations helps you take proactive steps to prevent sunburn and long-term skin damage. Hyannis, located in a humid continental climate zone, experiences significant UV exposure, particularly during the summer months. By keeping an eye on the UV Index, you can enjoy the beautiful beaches and outdoor activities while minimizing your risk of sun-related health issues.

Hourly UV Index in Hyannis

The UV Index throughout the day reveals a dramatic rise in solar intensity. Starting at a mild 1 at 07:00, it climbs steadily, reaching 2 by 08:00. The real spike occurs as the sun climbs higher, with the index jumping to 4 at 09:00, before peaking at a striking 11 by 13:00—the highest risk of the day. After this peak, the UV levels gradually taper off, dropping to 8 at 15:00, and settling to a gentle 2 by 18:00. Remember to don that sunscreen during the midday hours to protect your skin from the sun’s powerful 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
13:0011extreme10 min
14:0010very high15 min
15:008very high15 min
16:005moderate30 min
17:003moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Hyannis

Throughout the year, UV Index values exhibit significant seasonal variations, indicating higher risks during the peak summer months. January and December have a moderate UV Index of 3, allowing for a burn time of 30 minutes. As winter transitions into spring, February sees an increase to 5, while March escalates to a 6 (high category). The UV Index peaks during the summer, particularly in June and July, reaching an extreme level of 11, where the burn time drops to just 10 minutes. April and May present very high levels at 8 and 10, respectively. As summer wanes, August and September remain notably high with UV Index readings of 10 and 9. Finally, October registers a high UV level of 6, before dropping back to moderate levels in the late fall and winter months. To ensure safety, it is crucial for visitors and residents to take precautions, especially during April through September, where the risk of harmful UV exposure is highest. Wearing sunscreen, protective clothing, and seeking shade during peak hours are highly recommended during these months.

Monthly Maximum UV Index for Hyannis, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Hyannis. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec3568101111109643
Data source: Statistical UV Index data for Hyannis, 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 Hyannis UV Index with Other United States Cities

The table above highlights how UV exposure in Hyannis 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.
Hyannis'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
Hyannis3568101111109643
Los Angeles UVI46891011111010754
Houston UVI589111112121110975