Concerns · 6 min read
Sunscreen for South African Sun: What Actually Protects You
South Africa has some of the highest year-round UV levels of any country with a skincare market. How to read an SPF label, what SPF does not tell you, and which texture suits which skin.
Why the sun here is different
South Africa sits between roughly 22° and 35° south, which puts most of the country under strong year-round UV. Altitude adds to it: UV intensity rises by about 10% for every 1,000 metres, and Johannesburg sits at 1,750 metres. The result is a UV index that reaches extreme levels in summer and stays high in winter, when most people stop wearing sunscreen.
What an SPF number does and does not tell you
SPF measures protection against UVB, the wavelength that burns. It says nothing about UVA, the wavelength that drives ageing and pigmentation and passes straight through glass.
The scale is also misleading. SPF 15 blocks about 93% of UVB, SPF 30 about 97%, and SPF 50 about 98%. Going from 30 to 50 is a small gain, and neither is worth much if you apply a quarter of the amount used in the test — which is what most people do.
Look for broad spectrum or a UVA rating as well as the SPF number. A high SPF with weak UVA protection is not protecting you from the damage you are trying to avoid.
Texture decides whether you actually wear it
The best sunscreen is the one you will reapply. Broadly:
- Gel and fluid formulas suit oily and acne-prone skin, and sit best under makeup
- Cream formulas suit dry skin and give more slip
- Tinted mineral formulas are the ones to choose if pigmentation is a concern, because iron oxides block the visible light that drives melasma
- Stick and spray formats are for reapplication over makeup and on the move, not for the first application of the day
How to actually use it
- Two finger-lengths for the face and neck, or roughly a teaspoon
- Apply before you leave, and reapply every two hours outdoors
- Do not skip the ears, the neck, the backs of the hands or the hairline
- Winter and overcast days still count. UVA passes through cloud
- If you are using retinoids or acids, your skin is more photosensitive, not less
Antioxidants and sunscreen work as a pair: sunscreen reduces how much UV reaches the skin, and an antioxidant serum neutralises the free radicals that get through anyway.
Shop SK1N's sun protection edit, or read more about why mineral and chemical filters behave differently.
FAQ
Frequently Asked Questions
What SPF should I use in South Africa?+
SPF 30 or higher and broad spectrum, every day. In summer and at altitude, SPF 50 with strong UVA protection is the better choice.
Do I need sunscreen in winter?+
Yes. UVA passes through cloud and glass, and it is the wavelength that drives ageing and pigmentation.
How often should I reapply sunscreen?+
Every two hours when you are outdoors, and after swimming, sweating or towelling off.
Is mineral sunscreen better than chemical?+
Neither is better overall. Mineral filters are preferred for reactive skin and after procedures, and tinted mineral formulas are the better choice for pigmentation.