UV Index in Heidelberg, South Africa

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents and visitors in Heidelberg, South Africa, where the Cwb climate can lead to significant sun exposure, especially during the warmer months. With UV levels often peaking between 11:00 AM and 1:00 PM, awareness of these levels helps in preventing sunburn and maintaining healthy skin. By recognizing the UV index, you can take proactive measures to protect yourself against harmful rays, particularly when levels reach 6, indicating a high risk of harm from unprotected sun exposure. Stay informed and enjoy the beautiful South African sun safely!

Hourly UV Index in Heidelberg

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 Heidelberg

Throughout the year, UV Index values fluctuate significantly, with the highest risk typically spanning December to March and again in September to November when the index reaches extreme levels. January and February show a consistent UV Index of 15, while March experiences a slight decline to 13. Residents and visitors should exercise extreme caution during these months, limiting sun exposure to no more than 10 minutes to prevent skin damage. As spring approaches, the UV Index decreases, with May and June showing values of 7 and 6, respectively, allowing for longer safe exposure of 25 minutes. However, as August arrives, the index spikes again to 9, necessitating caution with a burn time of 15 minutes. Overall, it is crucial to stay informed and protected against harmful UV rays, especially during the high-risk months, by wearing adequate sunscreen, protective clothing, and sunglasses.

Monthly Maximum UV Index for Heidelberg, South Africa

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

The table above highlights how UV exposure in Heidelberg 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.

Heidelberg'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 UVI	15	15	13	10	7	6	6	8	11	12	14	16
Heidelberg	15	15	13	10	7	6	6	9	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