Last updated: August 1, 2025
In Rock Island, Canada, being aware of the UV Index is crucial for safeguarding your skin health, especially during sunny summer months. Understanding the UV levels can help you prevent sunburn and long-term skin damage, allowing you to enjoy the outdoors without compromise. With its Dfb climate, Rock Island experiences significant UV exposure, particularly between 11:00 AM and 2:00 PM, when the index peaks at a high of 9. Whether you’re gardening, hiking, or simply soaking in the sun, knowing the UV Index can make all the difference in protecting yourself and enjoying the beautiful Canadian landscape safely.
Throughout the day, the UV Index displays a dynamic progression that's crucial for sun safety. Starting at a low 1 at 7:00 AM, it gradually ascends, reaching 2 by 8:00 AM. As the sun climbs higher, the index peaks at 9 by 1:00 PM, marking the time for heightened caution. From this zenith, it gradually declines: 8 at 2:00 PM, down to 6 by 3:00 PM, and further softening to 3 by 5:00 PM. By evening, the index settles back at 2 at 6:00 PM, and finally returns to 1 as the sun sets at 7:00 PM. It's imperative to protect your skin during the peak hours, especially from 10:00 AM to 2:00 PM, when the UV rays are most intense.
| 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 | 8 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV exposure varies significantly, with the highest risk occurring during the summer months of May through August. During this period, the UV Index reaches a peak of 9, classified as very high, with a minimal burn time of just 15 minutes. Conversely, the UV Index is at its lowest in January and December at 2, indicating a low risk of harm from sun exposure, allowing for a burn time of 45 minutes. April and September mark transitional months where the UV Index is high at 7, prompting caution with a burn time of 25 minutes. To protect against harmful UV radiation, it is crucial for both visitors and residents to take appropriate precautions, particularly from May to August, such as 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Edmonton UVI | 2 | 3 | 5 | 6 | 7 | 7 | 8 | 7 | 6 | 4 | 2 | 1 |
| Calgary UVI | 2 | 3 | 4 | 6 | 8 | 8 | 9 | 8 | 7 | 4 | 2 | 1 |
| Montreal UVI | 2 | 4 | 5 | 7 | 9 | 9 | 8 | 8 | 7 | 5 | 3 | 2 |
| Ottawa UVI | 2 | 4 | 5 | 8 | 9 | 9 | 8 | 8 | 7 | 5 | 3 | 2 |
| Rock Island | 2 | 4 | 5 | 7 | 9 | 9 | 9 | 8 | 7 | 5 | 3 | 2 |
| Toronto UVI | 2 | 4 | 5 | 8 | 9 | 9 | 9 | 9 | 7 | 5 | 3 | 2 |