Last updated: June 2, 2025
Understanding the UV Index in Florence, United States, is crucial for safeguarding your skin and overall health. Awareness of UV levels helps prevent sunburn and reduces the risk of long-term skin damage, making it essential for everyone enjoying the sunny climate of Florence. With its Dfb climate, characterized by warm summers and varying UV exposure throughout the day—peaking at a level 10 between noon and 2 PM—Florence residents and visitors should stay informed. By monitoring the UV Index, you can take appropriate precautions, ensuring that your time outdoors is both pleasurable and safe.
As the sun rises, the UV Index begins its ascent, starting at a modest 1 at 07:00 and gradually climbing throughout the morning. By 10:00, it reaches 5, signaling the time to lather on that sunscreen. The peak arrives between 13:00 and 14:00, hitting a maximum of 10, indicating that protective measures are essential. As the afternoon progresses, the index dips slightly to 9 at 15:00, and continues to decline, reaching 3 by 18:00. By the time the sun sinks, the UV threat diminishes to 2 at 19:00, making it clear that midday sun worshippers should be particularly cautious, while evening strollers can enjoy the waning rays with less concern.
| 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 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
Throughout the year, UV Index levels exhibit significant seasonal variation. January and December have low UV exposure, with indices of 2, allowing for a lengthy burn time of 45 minutes. As we transition to February (UV Index 4) and March (UV Index 6), the risk escalates to moderate and high, reducing safe exposure time to 30 and 25 minutes, respectively. The peak months for UV exposure occur during April to August, with indices reaching a high of 10 in June and July, categorized as very high and necessitating a brief burn time of just 15 minutes. By October, the index decreases to 5, then further settles at 3 in November. Residents and visitors are advised to exercise caution during the high-risk months of April through August, using sunscreen, protective clothing, and seeking shade to minimize the risk of skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Florence | 2 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 5 | 3 | 2 |
| 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 |
| 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 |