Last updated: July 2, 2025
In Petersburg, United States, understanding the UV Index is crucial for protecting your skin and overall health. As UV levels can soar, particularly between 10 AM and 4 PM, being aware of these fluctuations helps you take necessary precautions against sunburn and long-term skin damage. With a BSk climate that features dry, sunny conditions, residents and visitors alike should remain vigilant about UV exposure risks, especially during peak hours when the index reaches a high of 12. Stay informed and enjoy the sunshine responsibly!
The UV Index today presents a dynamic profile throughout the day, starting with mild levels in the early morning at 1 from 7 AM to 9 AM. As the sun climbs higher, the index reaches moderate levels of 4 by 10 AM and surges to a peak of 12 at 2 PM. The afternoon sun is at its strongest, with readings of 11 and 12 between 1 PM and 2 PM, which calls for caution if you're planning to be outdoors. However, relief comes as the afternoon wanes, dropping to 8 by 4 PM, then gradually falling to 3 by 6 PM and finally returning to a low 1 after 7 PM. Stay sun-safe today and enjoy the sunshine responsibly!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 4 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 11 | extreme | 10 min |
| 16:00 | 8 | very high | 15 min |
| 17:00 | 6 | high | 25 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index fluctuates significantly, with peak levels occurring during the summer months. January starts with a moderate UV Index of 5, allowing for a burn time of 30 minutes. As the season progresses, February sees a rise to 7 (high) and a reduced burn time of 25 minutes. The risk escalates dramatically in March with a very high index of 9 and a burn time of just 15 minutes. This trend continues into April and May, both classified as extreme at 11, where the burn time diminishes to 10 minutes. The peak months of June, July, and August maintain a 12 (extreme) rating, necessitating frequent protection as exposure can lead to quick burns. In September and October, the index remains high at 10 and 8 (very high), respectively, with burn times returning to 15 minutes. November reduces to 6 (high) with a burn time of 25 minutes, finally tapering off in December to a moderate 4 and a safe burn time of 30 minutes. Residents and visitors should exercise caution, especially from March through October, utilizing sunscreen, wearing protective clothing, and limiting sun exposure during peak hours to safeguard against harmful UV radiation.
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 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Petersburg | 5 | 7 | 9 | 11 | 11 | 12 | 12 | 12 | 10 | 8 | 6 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |