UV Index in Johannesburg, South Africa

Last updated: June 2, 2025

Being aware of the UV Index in Johannesburg, South Africa, is crucial for safeguarding your skin against harmful ultraviolet rays. Understanding UV levels plays a vital role in preventing sunburn and promoting long-term skin health, particularly in a city known for its high sun exposure. With a Cwb climate, Johannesburg experiences significant UV radiation, especially during midday hours when the index can peak at 6. Staying informed about the UV Index not only helps you enjoy the beautiful sunny days but also protects you from the associated risks of overexposure.

Hourly UV Index in Johannesburg

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!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
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

Monthly UV Index Trends in Johannesburg

Throughout the year, UV index levels fluctuate significantly, with extreme risks predominating in the high-risk months of January, February, March, September, October, November, and December. During these months, the UV Index reaches levels as high as 16, indicating a 10-minute burn time for unprotected skin. In contrast, the UV Index decreases in the middle of the year, with May to July experiencing a high category (UV Index 6-7) and 25-minute burn time. As summer ends, the UV Index rises again in August to 8, presenting a very high risk. Visitors and residents are strongly advised to take precautionary measures during high UV months by applying sunscreen, wearing protective clothing, and limiting sun exposure, particularly during peak hours. Awareness of these seasonal changes is crucial for maintaining skin health year-round.

Monthly Maximum UV Index for Johannesburg, South Africa

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Johannesburg. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Johannesburg, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Johannesburg UV Index with Other South Africa Cities

The table above highlights how UV exposure in Johannesburg compares to other major locations across South Africa. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Johannesburg's solar exposure compared to other cities in South Africa. Generated using Copernicus Atmosphere Monitoring Service information.
	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	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