Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Sioux Lookout, Canada, where summers boast long, sunny days and abundant outdoor activities. Being aware of UV levels can significantly aid in sunburn prevention and maintain skin health, especially during peak hours when the index soars to 8 around noon. The Dfb climate of Sioux Lookout contributes to fluctuating UV exposure, making it essential for locals to stay informed about daily UV readings. By prioritizing UV Index awareness, you can enjoy the sun responsibly while protecting your skin from harmful effects.
The UV index throughout the day reveals a fascinating pattern of sun intensity. Early risers will notice a gentle start at 1 around 7:00 AM, gradually climbing to a moderate 3 by 9:00 AM. As the sun reaches its peak, the index hits 6 at 11:00 AM, escalating to an impressive 8 from 12:00 PM to 2:00 PM—the height of solar exposure. After this, the UV levels begin to wane, dropping to 7 at 3:00 PM, and further decreasing to moderate numbers of 5, 3, and 2 as the sun sets, concluding the day with a calm 1 at 7:00 PM. Remember, during the peak hours, sun safety is crucial!
| 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 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index reflects significant seasonal changes, influencing sun safety for both visitors and residents. The highest risk months for UV exposure are May to July, when the index reaches its peak at 9 in June, indicating a very high exposure category and a burn time of just 15 minutes. As spring transitions into summer, attention should be heightened, particularly in April with an index of 7 (high) and a burn time of 25 minutes, as well as in August and September, when the index remains in the high range. Conversely, the winter months—January, November, and December—present a low UV risk, with indices between 1 and 2 and extended burn times of 45 minutes. Visitors and residents should take proactive measures during high UV months, such as using sunscreen, wearing protective clothing, and seeking shade, while enjoying more relaxed sun safety practices in the cooler months.
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 |
| Sioux Lookout | 2 | 3 | 5 | 7 | 8 | 9 | 8 | 7 | 6 | 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 |
| Toronto UVI | 2 | 4 | 5 | 8 | 9 | 9 | 9 | 9 | 7 | 5 | 3 | 2 |