Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Stellenbosch, South Africa, where the sun can be both a source of warmth and a potential hazard. With a Mediterranean climate characterized by hot, dry summers, the UV levels often reach moderate to high during midday, making it essential to be aware of sun exposure to prevent sunburn and protect skin health. By keeping an eye on the daily UV Index, you can take proactive measures to enjoy the beautiful outdoors while safeguarding your skin from potential damage. As you explore Stellenbosch's scenic vineyards and outdoor activities, remember that the UV Index typically peaks around noon, highlighting the importance of sun protection during those critical hours.
The UV Index for today paints a clear picture of sun intensity throughout the hours. Starting from a low of 0 at 07:00, the day gradually warms up, reaching 1 by 08:00 and maintaining that level until 09:00. As the sun climbs higher, we see a rise to 2 at 10:00 and peaking at 4 by 13:00—the most critical time for sun exposure. After this midday high, the index dips slightly to 3 between 14:00 and 12:00, before gradually decreasing towards the evening, arriving back at 0 by 19:00. Remember to protect your skin during the peak hours when the UV Index hits its highest levels!
| 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 | 3 | 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 |
The UV Index experiences significant seasonal fluctuations, peaking during the winter months. January and February record an extreme UV Index of 14 and 13 respectively, with a rapid burn time of just 10 minutes. This trend continues into March with an index of 11. As spring arrives in April, the UV Index drops to 8 (very high), allowing for 15 minutes of exposure before burning occurs. From May to July, the UV Index levels decrease to 5 and 4 (moderate), extending burn times to 30 minutes. However, the UV exposure rises again in late summer, with August at 6 (high) and 25 minutes of burn time. As fall approaches, the UV levels rebound in September to 9 (very high) before shifting back to extreme levels in October (11) and November (12), both with a burn time of 10 minutes. December mirrors January, reaching UV levels of 14. Visitors and residents should take precautionary measures during high-risk months (January to March, October to November) by applying sunscreen, wearing protective clothing, and limiting sun exposure during peak hours to mitigate the risks associated with high UV exposure.
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 |
| Stellenbosch | 14 | 13 | 11 | 8 | 5 | 4 | 4 | 6 | 9 | 11 | 12 | 14 |
| 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 |