Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Randburg, South Africa, particularly given its distinct climate. With typical exposure risks peaking during the midday hours, knowing the UV levels can significantly aid in preventing sunburn and promoting skin health. Randburg's climate, categorized as Cwb, means that UV levels can vary, making it essential to stay informed. At noon, for instance, the UV Index reaches a high of 6, indicating a need for protective measures to safeguard your skin. Awareness of UV levels empowers you to enjoy the beautiful South African sun while minimizing harmful effects.
The UV Index today showcased a notable increase from the early morning hours, starting at a gentle 1 at 07:00 and 08:00. As the sun rose higher in the sky, the index climbed steadily, reaching a significant 6 by 12:00, indicating a peak in UV radiation and the need for sun protection. The afternoon saw a slight decline, with values dropping to 4 at 14:00 and falling further to 2 by 15:00. As the day wound down, the UV index returned to a safer range, ending the day at 0 by 19:00. It’s crucial to stay informed and safeguard your skin during those high UV hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 4 | moderate | 30 min |
| 11:00 | 5 | moderate | 30 min |
| 12:00 | 6 | high | 25 min |
| 13:00 | 5 | moderate | 30 min |
| 14:00 | 4 | 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 fluctuations throughout the year, with the highest levels occurring in the winter months. From January to March, the index remains extremely high, peaking at 16 in December and consistently staying around 15 to 14 until late November. During these months, burn times are critically short, averaging just 10 minutes. As spring approaches, a slight decrease occurs in April to a very high level of 10, followed by lower high levels of 7 to 6 from May through July, which afford burn times of about 25 minutes. August sees a rise back to 9 before the UV Index sharply increases again to 11 in September and peaks once more in October with 13. Visitors and residents should be especially cautious between January and March, as well as September through November, when exposure is categorized as extreme. It is advisable to take protective measures 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cape Town UVI | 14 | 13 | 11 | 8 | 5 | 3 | 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 |
| Randburg | 15 | 15 | 13 | 10 | 7 | 6 | 6 | 9 | 11 | 13 | 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 |