Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Lerwick, United Kingdom, where the coastal climate can lead to unexpected sun exposure. With average UV levels peaking at 7 during midday hours, being aware of these levels is essential for preventing sunburn and protecting skin health. This is especially important in a region like Lerwick, characterized by its cool, temperate climate (Cfb), where overcast skies might mask harmful rays. Stay informed and enjoy the outdoors while keeping your skin safe!
The UV Index starts off gently at 07:00 with a low reading of 1, perfect for a calm morning stroll. As the sun climbs higher, the index rises to 3 by 09:00, indicating a bit more sun exposure is on the way. The real peak occurs around 13:00, hitting 7—a reminder to slather on that sunscreen! The intensity begins to wane as the afternoon progresses, settling back to 6 by 12:00 and dropping to 4 by 16:00. As the sun starts to dip, the UV Index decreases to 1 by 19:00, making for a pleasant evening outside. Remember, during those peak hours, staying protected is key!
| 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 | 6 | high | 25 min |
| 13:00 | 7 | high | 25 min |
| 14:00 | 6 | high | 25 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV Index levels display significant seasonal variation that impacts sun exposure risks. From January to March, the UV Index remains low (1-2), allowing for extended safe sun exposure of about 45 minutes before burns occur. As spring approaches in April and May, the Index rises to moderate levels (4-5) with a reduced safe exposure time of 30 minutes. The summer months of June and July present the highest risk, with UV Index values peaking at 7 and 6, categorizing them as high exposure months, where the safe burn time drops to just 25 minutes. Although August and September see a return to moderate levels, caution is still advised. October to December revert back to low UV Index levels (1-2), offering safer sun exposure times of 45 minutes. Given these fluctuations, it is essential for visitors and residents to take protective measures—especially during the high-risk summer months—by applying sunscreen, wearing protective clothing, and seeking shade during peak daylight hours for their safety.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lerwick | 1 | 1 | 2 | 4 | 5 | 7 | 6 | 5 | 4 | 2 | 1 | 1 |
| 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 |