South Africa · -26.20, 28.05
Today's peak is extreme. Unprotected skin burns in about 11 min at the worst hour. Treat the sun as a hazard: stay indoors or fully covered.
Johannesburg sits at 26.2° S, in the southern hemisphere. Today's UV peaks at 14.8: the "extreme" band, which uvlevel.net treats as extreme danger for unprotected skin at the worst hour.
In the Southern Hemisphere at this latitude, UV climbs highest around December and January and eases, without disappearing, around June and July. Even the winter trough here can still cross the moderate band near midday.
Johannesburg sits about 1743 m above sea level. Thinner air scatters and absorbs less UV on the way down, so uvlevel.net adds roughly 14% to the modelled index here: uv = max(weather, CAMS) × (1 + 0.08 × metres/1000). That correction is already folded into every number on this page.
| Local time | UV index | Risk |
|---|---|---|
| 00:00 | 0 | No danger |
| 01:00 | 0 | No danger |
| 02:00 | 0 | No danger |
| 03:00 | 0 | No danger |
| 04:00 | 0 | No danger |
| 05:00 | 0 | No danger |
| 06:00 | 0.3 | No danger |
| 07:00 | 1.7 | No danger |
| 08:00 | 4.6 | Caution |
| 09:00 | 8.7 | Serious danger |
| 10:00 | 12.5 | Extreme danger |
| 11:00 | 13.9 | Extreme danger |
| 12:00 | 14.8 | Extreme danger |
| 13:00 | 12.6 | Extreme danger |
| 14:00 | 9.9 | Serious danger |
| 15:00 | 7.9 | Danger |
| 16:00 | 3.5 | Caution |
| 17:00 | 2.2 | No danger |
| 18:00 | 1 | No danger |
| 19:00 | 0.1 | No danger |
| 20:00 | 0 | No danger |
| 21:00 | 0 | No danger |
| 22:00 | 0 | No danger |
| 23:00 | 0 | No danger |
| Skin type | Time to burn |
|---|---|
| I · always burns, never tans | 9 min |
| II · burns easily | 11 min |
| III · burns sometimes | 16 min |
| IV · rarely burns | 20 min |
| V · brown skin | 27 min |
| VI · deeply pigmented | 45 min |
Yes. UV in Johannesburg is forecast to reach 3 or higher from 07:27 to 16:24 local time today, peaking at 14.8.
UV is highest in Johannesburg at around 12:00 local time today, reaching 14.8.
At today's peak of 14.8, fair skin (Fitzpatrick type II) with no sunscreen burns in about 11 min. Darker skin types take longer. See the table above for every type.
In the Southern Hemisphere at this latitude, UV climbs highest around December and January and eases, without disappearing, around June and July. Even the winter trough here can still cross the moderate band near midday.
Forecasts and elevation from Open-Meteo. The second UV opinion contains modified Copernicus Atmosphere Monitoring Service (CAMS) information; neither the European Commission nor ECMWF is responsible for how it is used here.
uvlevel.net gives general sun-safety guidance, not medical advice. Photosensitising medication, skin conditions, infants and a history of skin cancer all call for stricter limits than shown here.