Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Guernsey, United States, particularly given its BSk climate, where sunny days can lead to heightened sun exposure. The UV levels can soar at midday, with a peak index of 11 around noon, indicating a very high risk for sunburn and increased chances of skin damage if precautions aren’t taken. By being aware of these levels, you can protect your skin and overall health, ensuring you enjoy the beautiful Guernsey weather safely. Whether you're planning a day outdoors or simply running errands, staying informed about the UV Index helps you take necessary steps against harmful ultraviolet radiation.
The UV Index showcases a dramatic rise as the day progresses, peaking at noon with a striking value of 11. Starting from a gentle 1 at 07:00, the index escalates through the morning, hitting 4 by 09:00 and escalating sharply to 7 at 10:00. The intensity continues to ramp up, reaching a notable 9 by 11:00. As the sun reaches its zenith, the UV Index remains steadfast at 11 from 12:00 to 13:00, signaling a need for sun protection during these hours. A gradual decline follows, with values descending to 10 at 14:00, then 9 at 15:00. As daylight fades, the UV Index gently recedes, finishing the day at 2 by 18:00 and dropping back to 1 by 19:00. This dynamic data highlights the importance of monitoring UV exposure, especially during peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 9 | very high | 15 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 |
Throughout the year, the UV Index exhibits significant seasonal variation, with the highest levels typically occurring from June to August. During these months, particularly in June and July, the UV Index reaches an extreme level of 11, necessitating careful sun protection as the burn time is reduced to just 10 minutes. April and May also present high risk with a very high UV Index of 10 and a burn time of 15 minutes. As daylight savings transitions into the fall, the UV Index notably decreases but remains a concern until October, when it falls to 6 (high risk). Residents and visitors are advised to take precautions during the peak months, such as seeking shade, wearing protective clothing, and applying sunscreen, to minimize the risk of skin damage and enhance outdoor enjoyment safely.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
| Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| Guernsey | 3 | 5 | 7 | 10 | 10 | 11 | 11 | 10 | 8 | 6 | 4 | 3 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |