UV Index in Arniston, South Africa

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents and visitors in Arniston, South Africa, where the sun's rays can have a significant impact on skin health. Awareness of UV levels is essential for preventing sunburn and reducing long-term skin damage. With Arniston's characteristic BSk climate bringing plenty of sunshine, it's important to recognize when UV exposure peaks—typically around midday, when levels can reach up to 5. By staying informed about the UV Index, you can enjoy the beautiful coastal environment while protecting yourself from harmful rays.

Hourly UV Index in Arniston

The UV Index data reveals a dynamic progression throughout the day. Starting at 0 at 7:00 AM, the intensity begins to rise slowly, reaching 1 by 8:00 AM and 9:00 AM. By 10:00 AM, it escalates to 3, indicating a moderate level of UV exposure. 11:00 AM sees the index peak at 4, and the sun reaches its zenith by noon with a UV Index of 5, marking a high risk level. The afternoon maintains this peak at 5 until 1:00 PM, before gradually declining to 4 at 2:00 PM and further down to 3 by 3:00 PM. As the sun sets, the UV radiation drops sharply, returning to 1 at 4:00 PM and 5:00 PM, and finally back to 0 from 6:00 PM onward. Awareness of these fluctuations can guide outdoor plans, ensuring protection during the peak 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	0	low	45 min
08:00	1	low	45 min
09:00	1	low	45 min
10:00	3	moderate	30 min
11:00	4	moderate	30 min
12:00	5	moderate	30 min
13:00	5	moderate	30 min
14:00	4	moderate	30 min
15:00	3	moderate	30 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 Arniston

The UV Index exhibits significant seasonal changes, peaking during the winter months and again in the fall. The most high-risk months for UV exposure are January, February, October, November, and December, all categorized as extreme, with a dangerously short burn time of only 10 minutes. Spring and early fall present very high UV levels in March and September, where burn times are more forgiving at 15 minutes. As summer approaches, the UV index drops to moderate levels between May and August, allowing for a safer exposure time of 30 minutes. Visitors and residents should take precautions during high-risk months, including wearing sunscreen, protective clothing, and avoiding direct sunlight during peak hours to minimize the risk of UV-related harm.

Monthly Maximum UV Index for Arniston, South Africa

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Arniston. 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 Arniston, 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 Arniston UV Index with Other South Africa Cities

The table above highlights how UV exposure in Arniston 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.

Arniston'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
Arniston	14	13	10	7	5	3	4	5	9	11	12	13
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
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