Last updated: June 2, 2025
In Saint John, Canada, staying aware of the UV Index is crucial for protecting your skin and overall health. Understanding the levels of ultraviolet radiation helps residents and visitors alike to prevent sunburn and reduce the risk of long-term skin damage. With a Dfb climate that brings a variety of weather conditions, it's important to recognize that UV exposure can be high, especially during the peak hours between 10 AM and 2 PM, where indices soar to 10. By monitoring the UV Index, you can enjoy the beautiful outdoors while keeping your skin safe under the sun!
The UV Index data reveals an intriguing pattern over the course of the day. Starting at 07:00 with a mild 1, the sun begins to assert its intensity. By 09:00, the index climbs to 3, signaling that it's time to pay attention to sun safety. The heat intensifies, peaking at 13:00 and 14:00 with a formidable 10, denoting a high risk of harm from unprotected sun exposure. However, as the day progresses, there's a gradual decline; 15:00 sees a 8, settling down to a gentle 3 by 18:00. As evening falls, the UV Index drops to 1 at 19:00, offering a welcome respite. This data illustrates the importance of sun protection during peak hours, particularly between 11:00 and 14:00, when UV exposure is at its highest.
| 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 | 9 | very high | 15 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
As the seasons change, so too does the UV Index, highlighting the need for awareness regarding sun exposure. January and December feature a low UV Index of 2, allowing for longer burn times of 45 minutes. In the spring, the UV Index begins to escalate, with April reaching a high of 7 (high exposure category) and a 25-minute burn time. The summer months, particularly May and June, present the greatest risk with a peak UV Index of 10 and a burn time of just 15 minutes. As we transition into late summer and fall, the UV Index decreases slightly, but September still holds a significant 7, indicating high risk. To ensure safety, residents and visitors should prioritize sun protection, especially from May through September, when UV radiation is at its highest. Appropriate measures include 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 |
| Saint John | 2 | 3 | 5 | 7 | 9 | 10 | 8 | 8 | 7 | 5 | 3 | 2 |
| Toronto UVI | 2 | 4 | 5 | 8 | 9 | 9 | 9 | 9 | 7 | 5 | 3 | 2 |