UV Index in Port Saint John's, South Africa

Last updated: July 2, 2025

In Port Saint John’s, South Africa, being aware of the UV Index is crucial for protecting your skin from harmful sun exposure. Understanding UV levels can help prevent sunburn and long-term skin health issues, making it essential for residents and visitors alike. With a Cfa climate that offers warm and sunny days, especially during peak hours when the UV Index rises to 4, it's vital to take precautions. Whether you're enjoying the beach or exploring the town, staying informed about UV exposure risks is key to enjoying the sun safely while safeguarding your skin's health.

Hourly UV Index in Port Saint John's

The UV Index for the day reveals a gradual increase in solar intensity as the sun climbs higher. Starting from a mild 1 at 07:00 and 08:00, the index nudges to 2 by 09:00 and peaks at 4 between 11:00 and 13:00, indicating a notable amount of UV exposure. As the afternoon progresses, the value slightly tapers off to 3 at 14:00 and dwindles down to 2 by 15:00. The evening brings a steep decline, with the index dropping to 1 at 16:00 and then to 0 after 18:00. Stay protected during the midday hours when the UV Index is at its highest!

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	3	moderate	30 min
11:00	4	moderate	30 min
12:00	4	moderate	30 min
13:00	4	moderate	30 min
14:00	3	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 Port Saint John's

During the year, UV exposure fluctuates significantly, with the most dangerous months being January, February, March, October, November, and December, all classified as extreme exposure with a UV Index ranging from 12 to 14 and a burn time of just 10 minutes. In April and September, residents and visitors should remain vigilant as UV levels peak at 9 and 15 minutes of burn time, placing them in the very high exposure category. From May to July, UV Index levels drop but remain elevated, with May and August experiencing high exposure and moderate burn times of 25 minutes, while June and July are classified as moderate with a 30-minute burn time. Given these fluctuations, it is crucial for residents and visitors alike to take appropriate precautions, particularly during the high-risk months, such as using broad-spectrum sunscreen, wearing protective clothing, and seeking shade during peak sunlight hours.

Monthly Maximum UV Index for Port Saint John's, South Africa

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

The table above highlights how UV exposure in Port Saint John's 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.

Port Saint John's'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
Port Saint John's	14	13	11	9	6	4	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