Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Onís, Spain, where the stunning landscapes and outdoor activities beckon all year round. Being aware of UV levels not only helps you enjoy the sun safely but also plays a vital role in preventing sunburn and protecting your skin health. With a Cfb climate that offers a mix of mild summers and wet winters, Onís can present unique UV exposure risks, particularly during peak hours, where the index can soar to levels of 11—indicating a very high risk of harm from unprotected sun exposure. Stay informed and protected to fully enjoy the beauty of Onís under the sun!
As the sun rises, the UV Index begins its ascent, peaking dramatically in the early afternoon. Starting at a modest 1 at 07:00, the intensity gradually climbs to 10 by 13:00. With 11 reached at both 14:00 and 15:00, it's essential to take precautions during these hours to protect your skin. As the day progresses, the UV Index starts to decline, tapering to 4 by 18:00 and finally settling at 2 by 19:00. This pattern highlights the importance of staying sun-safe, especially during peak hours when UV levels are most hazardous. Remember, a little awareness can make a big difference!
| 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 | 6 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 11 | 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 |
Throughout the year, UV index levels vary significantly, indicating changing risks for sun exposure. January and December present low UV levels (Index 2), allowing for longer safe exposure times of 45 minutes. As the year progresses, February brings a moderate risk with an index of 4, reducing safe exposure to 30 minutes. The risk escalates in March (Index 6, 25 minutes) and peaks during the summer months of June (Index 11, 10 minutes) and July (Index 10, 15 minutes), which are considered high-risk periods. August and September maintain very high levels (Indices 9 and 8, respectively), followed by a gradual decline in October (Index 5, 30 minutes) and November (Index 3, 30 minutes). To protect against harmful UV rays, it is crucial for visitors and residents to take extra precautions during the high-risk months from March to September, including wearing sunscreen, protective clothing, and seeking shade during peak sun hours.
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 |
| Onis | 2 | 4 | 6 | 8 | 9 | 11 | 10 | 9 | 8 | 5 | 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 |