Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors of Rosais, Portugal, especially given the region's Csb climate, which features mild summers and significant sunshine. Awareness of ultraviolet radiation levels helps empower individuals to protect their skin from harmful effects, such as sunburn and long-term skin health complications. With peak UV Index values reaching as high as 11 during midday hours, it's essential to gauge exposure risks in order to enjoy the beautiful outdoors safely. By staying informed, you can relish the sun while effectively safeguarding your skin!
Experience the daily rise and fall of the UV Index with remarkable clarity! As the sun climbs higher in the sky, the UV Index starts at a mild 1 at 07:00 and 08:00, making it a safe time for morning activities. However, watch as it surges to 4 by 10:00, reaching its peak at a striking 11 between 13:00 and 14:00—a reminder to embrace sun protection. The afternoon sun commands respect as it gradually dips to 10 at 15:00, before easing into the evening with readings of 8 at 16:00, 6 at 17:00, and finally settling to a gentle 2 by 19:00. Stay safe and enjoy your time under the sun!
| 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 | 9 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 10 | very high | 15 min |
| 16:00 | 8 | very high | 15 min |
| 17:00 | 6 | high | 25 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
Throughout the year, the UV Index exhibits significant seasonal variations that affect sun exposure risks. High-risk months typically occur from April to September, where UV levels rise sharply, peaking in June with an extreme UV Index of 11. During these months, the recommended burn time decreases, reaching as little as 10 minutes in June. As a result, it is crucial for visitors and residents to take precautions during this period, such as wearing protective clothing, applying sunscreen with a high SPF, and seeking shade, especially during midday hours. Conversely, the winter months of January, February, and December present a much lower risk, with moderate UV exposure levels and longer burn times of 30 minutes. Being mindful of these seasonal changes in UV levels can help ensure safer outdoor experiences year-round.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Braga UVI | 2 | 4 | 6 | 8 | 9 | 11 | 10 | 9 | 8 | 6 | 4 | 2 |
| Porto UVI | 2 | 4 | 6 | 8 | 9 | 11 | 10 | 9 | 8 | 6 | 4 | 2 |
| Amadora UVI | 3 | 5 | 6 | 9 | 10 | 11 | 10 | 9 | 8 | 6 | 4 | 3 |
| Lisbon UVI | 3 | 5 | 6 | 9 | 10 | 11 | 10 | 9 | 8 | 6 | 4 | 3 |
| Setubal UVI | 3 | 5 | 6 | 9 | 10 | 11 | 10 | 9 | 8 | 6 | 4 | 3 |
| Rosais | 3 | 5 | 7 | 8 | 10 | 11 | 10 | 10 | 9 | 7 | 4 | 3 |