UV Index in Williston, South Africa

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of Williston, South Africa, where sunburn and long-term skin health can be significantly impacted by ultraviolet radiation. With the region's BWk climate, temperatures can soar, leading to increased UV exposure, especially during midday when levels reach a peak of 5. By being aware of daily UV indexes, you can take proactive steps to protect your skin—whether it's applying sunscreen, wearing protective clothing, or seeking shade when UV levels are high. Stay informed to enjoy the sun safely in Williston!

Hourly UV Index in Williston

The UV Index data for the day reveals a progressive ascent in solar intensity, starting from a peaceful 0 at 07:00. As the sun rises higher in the sky, it peaks at 5 between 12:00 and 13:00, indicating a moderate risk for sun exposure. 11:00 and 10:00 see values of 4 and 2 respectively, signaling an increasing need for sun safety measures. As the afternoon unfolds, readings gently descend, dropping back to 3 by 15:00 and tapering to 0 after 18:00. Overall, it’s a day where vigilance is key during the midday hours, while mornings and evenings offer a respite from harmful rays.

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	2	low	45 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 Williston

Throughout the year, UV exposure varies significantly, with the highest levels occurring from January to March, and again in September, October, and November. These months present high-risk conditions, as indicated by an extreme UV Index of 15 and 16, necessitating a burn time of only 10 minutes for unprotected skin. April sees a notable decrease to a very high level, with a UV Index of 9 and a burn time of 15 minutes. Visitors and residents are advised to exercise extreme caution during these high-risk months by wearing protective clothing, using broad-spectrum sunscreen, and seeking shade when outdoors. As summer approaches, the UV Index moderates in June and July but still warrants attention, particularly in August. To minimize skin damage, it is essential to stay vigilant and take necessary precautions throughout the year.

Monthly Maximum UV Index for Williston, South Africa

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

The table above highlights how UV exposure in Williston 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.

Williston'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
Williston	15	15	12	9	6	4	5	7	11	12	14	16
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