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.
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!
Time | UVI | Category | Time to Burn |
---|---|---|---|
07:00 | 1 | low | 45 min |
08:00 | 2 | low | 45 min |
09:00 | 4 | moderate | 30 min |
10:00 | 7 | high | 25 min |
11:00 | 9 | very high | 15 min |
12:00 | 10 | very high | 15 min |
13:00 | 11 | extreme | 10 min |
14:00 | 10 | very high | 15 min |
15:00 | 8 | very high | 15 min |
16:00 | 5 | moderate | 30 min |
17:00 | 3 | moderate | 30 min |
18:00 | 2 | low | 45 min |
19:00 | 1 | low | 45 min |
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.
UV Risk Categories
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
Hyannis | 3 | 5 | 6 | 8 | 10 | 11 | 11 | 10 | 9 | 6 | 4 | 3 |
Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |