Last updated: June 2, 2025
In Saint Dennis, United Kingdom, awareness of the UV Index is essential for maintaining skin health and preventing sunburn. Understanding the fluctuating UV levels throughout the day can help residents and visitors stay safe under the sun's rays, particularly during the peak hours when UV exposure is highest—reaching a notable maximum of 9 around midday. The temperate Cfb climate in Saint Dennis means that while sunny days can be refreshing, they also carry a risk of increased UV exposure. By staying informed and taking protective measures, you can enjoy the outdoors while minimizing the risks associated with UV radiation.
The UV Index on this particular day begins its ascent at 07:00 with a moderate level of 1, gradually rising to 2 by 08:00. As the sun reaches its peak, the index climbs steadily, hitting 3 at 09:00 and soaring to a striking 5 by 10:00. The day’s intensity peaks at 12:00, with the UV Index at a sizzling 8. Just an hour later, it reaches its maximum of 9 at 13:00, signaling a time when sun protection is crucial. Thankfully, the intensity starts to wane after this peak, coming down to 8 at 14:00, and then gradually decreasing to 4 by 17:00. As evening approaches, the UV Index dips back to 2 at 18:00 and finally settles at 1 by 19:00, marking the end of a day filled with varying levels of UV exposure. Be sure to take precautions during those midday hours to shield yourself from the sun’s rays!
| 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 | 7 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 9 | 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 |
| Saint Dennis | 2 | 2 | 4 | 6 | 7 | 9 | 8 | 7 | 6 | 4 | 2 | 1 |