Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of Jansenville, South Africa, where the dry, semi-arid climate can lead to significant sun exposure. As UV levels often peak during the midday hours, being aware of these fluctuations is essential for sunburn prevention and maintaining healthy skin. With maximum UV Index values reaching 4 during midday, it's important to take protective measures, as overexposure can result in short-term harm and long-term skin issues. Stay informed and enjoy the sunny days safely in Jansenville!
The UV Index throughout the day reveals a dynamic pattern of sun intensity. In the morning, it starts off low, peaking at 1 by 09:00. As the sun climbs higher, we see a steady increase with the index reaching 3 by 11:00. The highest point occurs from 12:00 to 13:00, where the UV Index hits a robust 4, indicating a need for sun protection during those hours. Following this peak, the index gradually declines, returning to 2 at 15:00, and then dropping back down to 0 by 18:00, marking the end of significant UV exposure for the day. Plan your outdoor activities accordingly to stay safe under the sun!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 1 | low | 45 min |
| 10:00 | 2 | low | 45 min |
| 11:00 | 3 | moderate | 30 min |
| 12:00 | 4 | moderate | 30 min |
| 13:00 | 4 | moderate | 30 min |
| 14:00 | 3 | moderate | 30 min |
| 15:00 | 2 | low | 45 min |
| 16:00 | 1 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV levels fluctuate significantly, with January, February, March, October, November, and December marked as high-risk months due to their extreme UV Index ratings ranging from 14 to 15, necessitating a burn time of just 10 minutes. The transition into spring sees a decrease, with April and September categorized as very high (UV Index 8 and 10, respectively) and burn times of 15 minutes, while May offers a moderate UV Index of 6 over a 25-minute exposure. The summer months of June and July present a more moderate risk with UV Index ratings of 4, allowing for increased burn times of 30 minutes. However, August shifts back to high levels, akin to the spring months. To ensure safety, it is crucial for residents and visitors to limit sun exposure during high-risk months, particularly by seeking shade or applying broad-spectrum sunscreen to protect against the harmful effects of UV radiation.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cape Town UVI | 14 | 13 | 11 | 8 | 5 | 3 | 4 | 6 | 9 | 11 | 12 | 14 |
| Jansenville | 15 | 14 | 12 | 8 | 6 | 4 | 4 | 6 | 10 | 11 | 13 | 15 |
| Durban UVI | 14 | 13 | 12 | 9 | 6 | 4 | 5 | 7 | 9 | 11 | 13 | 15 |
| Johannesburg UVI | 15 | 15 | 13 | 10 | 7 | 6 | 6 | 8 | 11 | 12 | 14 | 16 |
| Pretoria UVI | 16 | 15 | 13 | 10 | 7 | 6 | 6 | 9 | 11 | 13 | 14 | 16 |
| Soweto UVI | 16 | 15 | 13 | 11 | 7 | 6 | 6 | 8 | 11 | 13 | 15 | 16 |