UV Index
UV Index
Today's UV index in Johannesburg, South Africa 
will be up to 4.5, indicating a moderate level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-06-21
With a UV index reaching up to 4.5 in Johannesburg, stay shaded during midday when the sun is strongest; wear protective clothing, a wide-brimmed hat, UV-blocking sunglasses; apply SPF 30+ sunscreen every 2 hours, even on cloudy days; and be cautious of heightened UV on bright surfaces.
Johannesburg's UV index ranges from moderate in winter (around 3-5) to very high in summer (up to 10 or 11), meaning the sun's rays are strongest during the warmer months. The city experiences a summer rainy season with afternoon thunderstorms, while winters are dry and mild, with temperatures cooling down but rarely freezing. Compared to other parts of South Africa, Johannesburg is cooler than the coastal areas and experiences more rainfall than the dry western regions. Neighboring countries like Botswana have drier, hotter climates, whereas Mozambique is more humid with a longer rainy season.
See the UV index hour by hour for Johannesburg, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.