Last updated: August 1, 2025
Understanding the UV Index in Tremembé, Brazil is crucial for maintaining skin health and preventing sunburn. With a humid subtropical climate (Cfa), residents and visitors alike face varying UV exposure risks throughout the day, peaking at a risky UV Index of 8 around noon. By staying informed about UV levels, individuals can take proactive measures to protect their skin from harmful effects, ensuring a safe and enjoyable experience under the Brazilian sun. Don't let the rays catch you off guard; awareness is your best defense!
The UV Index data paints a vivid picture of sun exposure throughout the day. In the early hours, from 7:00 AM to 9:00 AM, the UV Index remains low, peaking at only 1. However, as the sun climbs higher, from 10:00 AM to 12:00 PM, it surges to 8 at noon, marking the peak of solar intensity. The afternoon sees a slight decline, with the index dropping to 5 at 2:00 PM and further to 3 by 3:00 PM. As evening approaches, the UV levels plummet back to a safe 1 by 4:00 PM, and the sun's diminishing rays result in a 0 by 6:00 PM, signaling a welcome reprieve from UV exposure. Essentially, the peak intensity occurs during midday hours, highlighting the importance of seeking shade and wearing protection during these critical hours.
| 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 | 9 | very high | 15 min |
| 14:00 | 7 | 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, the UV Index demonstrates significant seasonal variability, with extremely high levels persisting in the winter months. January and February both feature a UV Index of 16, categorized as extreme, where the potential for skin damage from sun exposure occurs in as little as 10 minutes. As spring approaches, March and April maintain similarly high levels, with UV indices of 13 and 12, respectively. May marks a slight reduction to a very high exposure category (UV Index 8) with an increased burn time of 15 minutes, transitioning into June where it further drops to a high category (UV Index 6) allowing for a 25-minute burn time. The summer months of July and August return to very high levels, prompting caution with 15 minutes of safe exposure. As fall sets in, September and October see a rise back to extreme levels (UV Index of 12 and 14), requiring reduced exposure time of 10 minutes once more. Finally, November and December wrap up the year with UV indices of 15 and 16, respectively, reiterating the necessity of precaution. Visitors and residents should take proactive measures during these high-risk months by applying sunscreen frequently, wearing protective clothing, and seeking shade, especially during peak sun hours.
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 |
| Tremembe | 16 | 16 | 13 | 12 | 8 | 6 | 8 | 10 | 12 | 14 | 15 | 16 |
| 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 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |