Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the PressHive weather desk. Data from national met services via Open-Meteo.
[ph_weather]
The UV index in London today, as shown in the live forecast above, indicates the strength of the sun’s ultraviolet radiation. For most of the UK, a reading of 3 or higher means protection is needed during midday hours.
What is the UV index and how is it measured?
The UV index measures the intensity of ultraviolet radiation reaching the Earth’s surface. It runs from 0 to 11+, with 1–2 being low and 11+ extreme. The Met Office provides the official uv index met office readings used across the UK. For London and other inland areas, the index tends to be slightly lower than on the coast because of pollution and haze, but still reaches moderate levels in summer.
When does the UK see the highest UV index?
The uk uv index by month peaks between May and August, when the sun is highest in the sky. The highest uv index in uk typically occurs in southern England and can reach 8 on clear days. Even in Scotland, values can hit 6 or 7 during a heatwave. Always check the uv index today uk before planning time outdoors.
What is the highest UV index ever recorded in the UK?
The highest recorded UV index in the UK was 9, observed in parts of southeast England during the June 2020 heatwave. Such extremes are rare and usually require clear skies and a very high sun angle.
How does cloud cover affect the UV index?
Clouds can reduce UV by up to 50%, but thin or broken cloud still allows significant radiation through. Always check the uv index weather rather than assuming low UV on overcast days.
Why should I check the UV index today?
The uv index today uk bbc and other forecasts help you avoid sunburn and longer-term skin damage. Even on cool or cloudy days, the index can be moderate, especially in coastal areas where reflection from water increases exposure.
For the latest readings across the country, visit our UK weather hub or check the 10 day weather forecast UK for planning ahead.