Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Regional Report weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the UV index today to know when to protect your skin; it measures the strength of sunburn‑producing ultraviolet radiation from the sun. The live forecast above shows London’s current UV level — lower values need no action, but moderate and above call for shade, clothing and sunscreen.
What is the UV index?
The UV index is a simple 0–11+ scale that tells you how intense the sun’s ultraviolet rays are at a given time. It is calculated by the Met Office and other weather agencies using ozone, cloud cover and sun angle.
- 0–2 (Low) – no protection needed.
- 3–5 (Moderate) – wear sunscreen and cover up.
- 6–7 (High) – seek shade between 11am and 3pm.
- 8–10 (Very High) – extra precautions essential.
- 11+ (Extreme) – avoid being outside at midday.
How should I use today’s UV index?
For the uv index today London displayed above, note the value and take action if it reaches 3 or higher. Use the UK weather hub to compare UV levels in Birmingham, Glasgow or other cities.
- Apply SPF 30+ sunscreen when the index is 3 or more.
- Wear a hat, sunglasses and cover arms and legs.
- Protect children and babies – their skin is especially sensitive.
- Check the 10-day forecast to plan outdoor activities safely.
What does the UV index actually tell me?
It tells you the strength of ultraviolet radiation from the sun at ground level. A higher number means more energy reaches your skin, increasing the risk of sunburn and long‑term damage. Use it to decide when to protect yourself.
When is the UV index highest in the UK?
The uk uv index by month peaks from June to August, with July typically recording the highest values. On a clear June day in London, the index can reach 7–8 – well into the ‘high’ band. Cloud cover can lower it, but UV still penetrates thin cloud.
Should I check the UV index even on cloudy days?
Yes. UV rays can pass through light cloud and reflective surfaces like water or concrete. Up to 80% of UV reaches the ground on overcast days. For the most accurate uv index weather reading, refer to the live forecast above or the Met Office.