UV Index in Williston, South Africa

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents of Williston, South Africa, where the unique BWk climate can lead to heightened sun exposure. With UV levels peaking around midday, even a few minutes of direct sunlight can cause sunburn and long-term skin damage. By staying informed about the daily UV Index, you can take proactive measures to protect your skin and maintain overall health. Williston’s arid conditions can amplify UV radiation, making awareness essential for sun safety and enjoying the great outdoors without the risks.

Hourly UV Index in Williston

The UV Index throughout the day presents a dynamic interplay of sunlight, peaking at 12:00 PM and 1:00 PM with a robust 6. Early risers will enjoy the gentle warmth with a UV Index of 0 at 7:00 AM, slowly climbing to 1 by 8:00 AM. As the morning progresses, it reaches 3 at 10:00 AM and then escalates to its highest at noon. Afternoon hours see a gradual decline, dipping back to 5 at 2:00 PM before gently dropping to 3 by 3:00 PM. As the sun sets, the index retreats below 1 from 5:00 PM onward, concluding with a soothing 0 at 6:00 PM and remaining steady until dusk. Make sure to stay protected during the peak hours, especially when the sun's rays are at their strongest!

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	2	low	45 min
10:00	3	moderate	30 min
11:00	5	moderate	30 min
12:00	6	high	25 min
13:00	6	high	25 min
14:00	5	moderate	30 min
15:00	3	moderate	30 min
16:00	2	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