Last updated: July 2, 2025
In Penryn, United Kingdom, staying informed about the UV Index is crucial for safeguarding your skin and overall health. Understanding UV levels helps you take proactive steps against sunburn and long-term skin damage, particularly during the peak afternoon hours when the UV Index can reach as high as 8. With Penryn's temperate Cfb climate, residents and visitors alike must be aware of the typical exposure risks associated with sunny days, ensuring they enjoy the outdoors while protecting their skin. By keeping an eye on the UV Index, you can confidently embrace the beauty of Penryn without compromising your skin health.
The UV Index fluctuates throughout the day, reaching its peak of 8 between noon and 2 PM. Early risers will notice a gentle start, with levels at just 1 at 7 AM. As the sun climbs higher, the index rises steadily, hitting 5 by 10 AM and 6 by 11 AM. By 12 PM, the intensity peaks, prompting caution for those outdoors. After this midday surge, the index begins a gradual decline, dropping to 7 at 3 PM, and falling further to 4 by 5 PM. As evening approaches, UV levels decrease significantly, resting at 1 by 7 PM. It’s a clear reminder to stay sun-safe during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 8 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences notable changes throughout the year, with high-risk months typically occurring from April to August. In this period, the UV Index peaks at 9 in June, indicating a very high risk of harm from unprotected sun exposure, where the burn time drops to just 15 minutes. As spring transitions to summer, individuals should be especially vigilant, with April (UV Index 6) and May (UV Index 7) also classified as high risk months, requiring shorter burn times of 25 minutes. Conversely, the beginning of the year and late fall see lower UV levels, with January and February maintaining a UV Index of 2 and a burn time of 45 minutes. Visitors and residents are advised to take appropriate precautions during the high-risk months, such as wearing sunscreen, hats, and sunglasses while seeking shade during peak sun hours, to protect against potential skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Liverpool UVI | 1 | 2 | 3 | 5 | 7 | 8 | 8 | 7 | 5 | 3 | 2 | 1 |
| Sheffield UVI | 1 | 2 | 4 | 5 | 7 | 8 | 8 | 7 | 5 | 4 | 2 | 1 |
| Birmingham UVI | 1 | 2 | 4 | 5 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| London UVI | 1 | 2 | 4 | 5 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| Bristol UVI | 1 | 2 | 4 | 5 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| Penryn | 2 | 2 | 4 | 6 | 7 | 9 | 8 | 7 | 6 | 4 | 2 | 1 |