Last updated: July 2, 2025
In Sao Francisco, Brazil, awareness of the UV Index is crucial for safeguarding your skin health against the damaging effects of ultraviolet radiation. Understanding the UV levels can help prevent sunburn and long-term skin conditions, allowing you to enjoy the sun safely. With a climate classified as Aw, Sao Francisco experiences significant UV exposure, particularly during midday when index levels peak at 9 from 11 AM to 1 PM. By staying informed about these levels, residents and visitors can take proactive measures to protect themselves and enjoy the vibrant outdoor lifestyle this region offers.
The UV Index on this particular day showcased a notable peak between 11:00 AM and 1:00 PM, reaching a high of 9, indicating a very high level of UV radiation. Early risers at 7:00 AM were greeted with a modest index of 1, but as the sun climbed higher, the intensity increased dramatically. At 10:00 AM, the index hit 6, solidifying the day's progression towards its maximum. After the midday zenith, the UV levels began to decline, dropping back to 4 by 3:00 PM and tapering off further, ultimately reaching 0 by 7:00 PM. This pattern highlights the importance of sun safety, particularly during the peak hours when UV exposure poses the greatest risk.
| 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 | 6 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 6 | high | 25 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV Index levels demonstrate significant seasonal variation, highlighting periods when both visitors and residents must exercise caution to avoid harmful sun exposure. The highest risk months occur from January to April, when UV Index values soar to 16-13 in the extreme category, necessitating a burn time of just 10 minutes. August and September also present high risks with UV Index levels of 12, indicating extreme exposure once again. The late spring and summer months, particularly May through July, maintain a very high exposure category with a UV Index ranging from 10 to 9, but slightly longer burn times of 15 minutes. To protect skin health, it is vital for everyone to take necessary precautions during these high-risk periods, including seeking shade, wearing protective clothing, and applying sunscreen regularly.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rio de Janeiro UVI | 15 | 14 | 13 | 10 | 7 | 6 | 7 | 9 | 11 | 12 | 13 | 15 |
| Sao Paulo UVI | 16 | 15 | 12 | 11 | 8 | 6 | 7 | 9 | 11 | 13 | 14 | 15 |
| Belo Horizonte UVI | 17 | 16 | 14 | 12 | 9 | 7 | 8 | 10 | 12 | 13 | 14 | 16 |
| Salvador UVI | 14 | 14 | 14 | 13 | 10 | 9 | 9 | 12 | 12 | 15 | 15 | 14 |
| Sao Francisco | 16 | 15 | 14 | 13 | 10 | 9 | 9 | 12 | 12 | 14 | 15 | 15 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |