Last updated: June 2, 2025
In Hillsborough, United States, understanding the UV Index is crucial for protecting your skin from harmful ultraviolet radiation. With UV levels peaking at a striking 11 around midday, residents and visitors alike should be vigilant about sun exposure to prevent painful sunburns and long-term skin health risks. The climate here, characterized by warm summers typical of the Cfa zone, often leads to higher UV indices, making it essential to stay informed and take appropriate precautions. Whether enjoying outdoor activities or simply taking a stroll, being aware of the UV Index can help you enjoy the sunshine safely!
As the sun rises, the UV Index starts off gently at 1 by 7:00 AM, gradually climbing as the day progresses. By 10:00 AM, it reaches 6, signaling a notable increase in solar radiation. The intensity peaks at 12:00 PM with a striking 10 and continues to soar to a maximum of 11 at 1:00 PM, marking the hour of greatest exposure. As the afternoon unfolds, the index begins to taper off—dropping to 10 at 2:00 PM and 8 by 3:00 PM. By late afternoon, the UV Index gracefully descends to 4 at 5:00 PM, settling back to 2 by 6:00 PM and finally returning to a gentle 1 by 7:00 PM. This highlights the importance of sun protection during mid-day when UV rays are at their most intense.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 8 | 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 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV exposure varies significantly, peaking during the late spring and summer months. High-risk months for UV exposure include April through August, where the UV Index reaches very high to extreme levels, particularly in May, June, and July, with a dangerous UV Index of 11 and a burn time as short as 10 minutes. As such, it is crucial for visitors and residents to take precautions during these months, including wearing sunscreen, protective clothing, and sunglasses, while seeking shade during peak sun hours. Conversely, the winter months show a decrease in UV risk, with January and December marked as having moderate exposure, allowing for longer burn times of 30 minutes. By staying informed and taking necessary precautions, individuals can enjoy outdoor activities while minimizing their risk of UV-related harm.
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 |
| Hillsborough | 4 | 6 | 8 | 10 | 11 | 11 | 11 | 10 | 9 | 8 | 5 | 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 |