The UV Index in Portugal: What It Means and When to Protect Yourself

The UV Index in Portugal: What It Means and When to Protect Yourself

You hear about the UV index in the weather forecast, but do you really know what it means — and when you should start protecting yourself? In Portugal, one of the sunniest countries in Europe, understanding the UV index can save you from burns and protect your long-term health.

What is the UV index?

The UV index is an international scale that measures the intensity of the sun's ultraviolet radiation at a given time and place. It runs from 0 (no risk) to 11+ (extreme). The higher it is, the faster your skin burns.

The UV index scale explained

UV index	Risk level	What to do
0-2	Low	Minimal protection needed
3-5	Moderate	Seek shade at midday, use sunscreen
6-7	High	Sunscreen, shade, hat and sunglasses
8-10	Very high	Avoid the sun between 12 p.m. and 4 p.m.
11+	Extreme	Maximum protection; avoid exposure

What is the UV index like in Portugal?

Between May and September, the UV index in Portugal frequently reaches values of 8 to 10 (very high) at midday, especially in the south and in coastal regions. Even on days with a cool wind — typical of the Atlantic beaches — the UV index can be dangerously high, because the wind is deceptive: it cools the skin but doesn't reduce the radiation.

From what level should you protect yourself?

The rule is simple: from a UV index of 3, you should already protect yourself. That covers most spring and summer days in Portugal. Don't wait for the heat — UV radiation is not the same thing as temperature. Cool days can have high UV indices.

How to protect yourself on high-UV days

• UPF50+ shade: A certified shade like the Sunsha mainly protects your face and head — the most exposed areas — with fabric that blocks 98% of UV radiation. It doesn't cover the whole body, so always pair it with sunscreen and clothing for the rest of the body.
• SPF50+ sunscreen: Apply generously and reapply every 2 hours.
• Clothing and hat: UPF fabrics and a wide-brimmed hat cover what sunscreen can't reach.
• Timing: Avoid the peak between 12 p.m. and 4 p.m.
• UV400 sunglasses: Protect your eyes, which are often forgotten.

Frequently asked questions

Is the UV index high even on cloudy days?

Yes. Up to 80% of UV radiation passes through clouds. You can burn on an overcast day.

Does wind reduce the UV index?

No. Wind cools the skin and gives the feeling that the sun is weaker, but the UV radiation remains. That's why burns are common on windy Atlantic beaches.

Where can I check today's UV index?

IPMA (the Portuguese Institute for Sea and Atmosphere) publishes the daily UV index forecast for the whole country, and most weather apps show it too.

Knowing the UV index is the first step. The second is being prepared — a Sunsha UPF50+ shade for your face, sunscreen and clothing for the body, and the right habits help you enjoy Portugal's sun far more safely. ☀️