Last updated: July 2, 2025
In Castaras, Spain, understanding the UV Index is essential for safeguarding your skin and overall health. As a popular destination with a Mediterranean climate (Csa), the sun shines brightly, particularly during the peak hours between 12 PM and 2 PM, when UV levels can reach a staggering 12. Being aware of these levels helps you take proactive steps to prevent sunburn and long-term skin damage. By knowing when the UV Index is high, you can enjoy the beautiful sun-drenched days in Castaras while protecting yourself from the potential risks of overexposure. Stay informed and sun-safe!
As the sun rises, the UV Index gradually climbs, starting at a gentle 1 at 07:00 and maintaining that level through 08:00. By 09:00, it reaches 2, but the real intensity kicks in as the clock approaches midday. At 11:00, the index surges to 6, and by noon, it skyrockets to a burning 8. The peak of the day arrives between 13:00 and 14:00, where the UV Index hits a blistering 11 and 12, indicating the need for diligent sun protection. As the afternoon wanes, the intensity begins to taper off— falling to 9 at 16:00, then 7 at 17:00. By the time evening arrives, the index drops to a safer 4 at 18:00, and finally settles at 2 by 19:00, signaling a welcome respite from the sun's rays.
| 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 | 3 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 11 | extreme | 10 min |
| 16:00 | 9 | very high | 15 min |
| 17:00 | 7 | high | 25 min |
| 18:00 | 4 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
As the seasons change, so do the UV Index levels and associated risks for sun exposure. From January to February, the UV Index remains moderate (3-5), allowing for 30-minute burn times without immediate danger. However, a significant rise occurs in March through August, with very high (8-10) and extreme (11-12) levels reached, particularly in May through July, where burn times drop to just 10 minutes. September brings a slight decrease, returning to very high levels, while October and November see a moderation again, with burn times extending to 25-30 minutes. Visitors and residents should take extra precautions, especially from March to August, by seeking shade, wearing protective clothing, and applying sunscreen frequently during these high-risk months.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Barcelona UVI | 3 | 4 | 5 | 7 | 8 | 10 | 10 | 9 | 7 | 6 | 3 | 2 |
| Zaragoza UVI | 3 | 4 | 6 | 8 | 9 | 11 | 11 | 9 | 8 | 6 | 3 | 2 |
| Valencia UVI | 3 | 4 | 6 | 8 | 9 | 11 | 10 | 9 | 8 | 6 | 4 | 3 |
| Madrid UVI | 3 | 4 | 6 | 8 | 10 | 11 | 11 | 9 | 8 | 6 | 4 | 3 |
| Sevilla UVI | 3 | 5 | 7 | 9 | 10 | 11 | 10 | 10 | 9 | 7 | 4 | 3 |
| Castaras | 3 | 5 | 8 | 10 | 11 | 12 | 12 | 11 | 10 | 7 | 5 | 3 |