Sunburn and vitamin D by skin type
How quickly you burn by Fitzpatrick skin type and UV index, what to do at each UV level, and when your skin can actually make vitamin D.
General sun-safety information, not medical advice. Burn times vary enormously with skin, the UV index, altitude, reflection off snow or water, and some medicines — when in doubt, cover up. Any new, changing or unusual mole or spot should be checked by a doctor.
Two things pull in opposite directions
Sunlight is both the main natural source of vitamin D and the main cause of skin ageing and skin cancer, so sun safety is a balance rather than a ban. How that balance falls for you depends mostly on two things: your skin type, which sets how fast you burn and how quickly you make vitamin D, and the UV index, which sets how strong the sun is right now.
Fitzpatrick skin types
The Fitzpatrick scale is the standard way to describe how skin responds to sun, from Type I to Type VI. Find yourself here, then open your type's page for tailored advice.
| Type | Skin | Sun reaction |
|---|---|---|
| Type I | Very fair | Always burns, never tans. |
| Type II | Fair | Burns easily, tans minimally and poorly. |
| Type III | Light to medium | Sometimes burns mildly, tans gradually to a light brown. |
| Type IV | Olive / moderate brown | Rarely burns, tans easily and well. |
| Type V | Brown | Very rarely burns. |
| Type VI | Deeply pigmented | Never burns. |
Type I — Very fair
Always burns, never tans. Pale white skin, often with red or blond hair, light eyes and freckles.
Type II — Fair
Burns easily, tans minimally and poorly. Fair skin that may have freckles; light hair and eyes are common.
Type III — Light to medium
Sometimes burns mildly, tans gradually to a light brown. Light to medium skin — the most common European tone.
Type IV — Olive / moderate brown
Rarely burns, tans easily and well. Olive or moderate brown skin, common around the Mediterranean and parts of Asia and Latin America.
Type V — Brown
Very rarely burns. Brown skin that tans darkly and easily.
Type VI — Deeply pigmented
Never burns. Deeply pigmented dark brown to black skin.
Topics
The vitamin D window
Your skin only makes vitamin D when the sun is high enough — which, up north, it is not for months.
The UV index
A single number for how strong the sun is today, with the protection each level calls for.
How SPF works
What the SPF number means, why SPF 50 is not double SPF 30, and the amount almost everyone gets wrong.
Source: WHO Global Solar UV Index and general dermatology guidance on the Fitzpatrick scale. Burn times are qualitative and vary widely. · checked 2026-09-04
Frequently asked questions
How long can I stay in the sun before burning?
There is no single safe time — it depends on your skin type, the UV index, altitude and reflection off water or snow. Fair skin can start to burn within tens of minutes on a high-UV day; darker skin takes far longer. Use the UV index and protect before you feel anything.
What is my skin type?
The Fitzpatrick scale runs from Type I (always burns, never tans) to Type VI (never burns). The table below and the per-type pages help you place yourself and see what protection you need.
Do I need sunscreen if I have dark skin?
Darker skin has more natural protection and burns rarely, but not never, and sun still ages skin and carries some cancer risk. Protection on the highest-UV days and regular skin checks still make sense.
Top up vitamin D from your plate too
TempoLife's food database shows the vitamin D in foods, so winter does not leave you short.