It's easy to assume that grey British skies mean skin is safe from sun damage. It's one of the most common misunderstandings we hear, and it's also one of the most consequential for anyone managing pigmentation.

UVA doesn't care about cloud cover

UV light comes in two main types that matter for skin: UVB, which varies significantly with season and is the main cause of sunburn, and UVA, which stays relatively constant throughout the year, passes through cloud, and penetrates window glass. UVA is also one of the wavelengths most strongly linked to triggering and worsening pigmentation, including melasma. That means a cloudy commute, a desk near a window, or a drive with the sun behind clouds can still be contributing to pigmentation, even when it doesn't feel like ‘sun exposure’ weather.

Why this matters specifically for pigmentation

Existing pigmentation, whether it's melasma, sun spots or a fading mark from a breakout, tends to darken further with unprotected UV exposure, and can be undone entirely by it. This is true across skin tones, though guidance on how much daily protection is needed does vary: dermatology bodies note that for people with black or dark brown skin without other risk factors, routine daily sun protection is less critical for general skin health, but anyone actively managing pigmentation benefits from consistent SPF regardless of skin tone, since UV is one of the clearest triggers for it worsening.

Practical habits for UK life

•     Apply SPF as the last step of your morning routine, every day, regardless of the forecast

•     Don't rely on foundation or a moisturiser with SPF as your only protection if you're also managing pigmentation; a dedicated, adequately applied sunscreen matters

•     Reapply if you're outdoors for extended periods, even on an overcast day

•     Remember car and office windows filter UVB but not UVA, so time spent near glass still counts

•     Mineral SPF formulas tend to be a gentler starting point for sensitive or reactive skin

The takeaway

Sun protection isn't a summer habit or a beach-holiday habit here. For anyone working on pigmentation, it's a year-round, every-day one, and it's arguably the single most effective thing you can do alongside a gentle brightening routine.

FAQs

Do I need SPF on a cloudy day in the UK?

Yes. UVA passes through cloud cover largely unaffected, and it's one of the main triggers for pigmentation worsening, so daily protection matters regardless of visible sunshine.

Does SPF in my moisturiser count as sun protection?

It can help, but many people don't apply enough moisturiser to reach the tested SPF level, and it may not be reapplied through the day. A dedicated sunscreen, applied properly, is the more reliable option if you're managing pigmentation.

Is sun protection equally important for every skin tone?

Guidance varies: routine sun protection is generally considered less critical for very deep skin tones without other risk factors. But for anyone actively managing pigmentation, of any skin tone, consistent SPF makes a real difference, since UV exposure is one of the clearest triggers for pigmentation getting worse.

Research & further reading

•     British Skin Foundation — Navigating melasma in darker skin and menopausal skin: britishskinfoundation.org.uk/resources/navigating-melasma-a-guide-for-women-of-colour-and-menopausal-skin

•     British Association of Dermatologists — Melasma patient information leaflet: bad.org.uk/pils/melasma