Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Headlines UK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The UV index measures the strength of ultraviolet radiation from the sun. In the UK, it peaks between 11am and 3pm from April to September. Use the live forecast above to check today’s level and protect your skin when the index is 3 or higher.
What is the UV index scale and what do the numbers mean?
The UV index scale runs from 0 (low) to 11+ (extreme). In the UK, a reading of 1–2 is low, 3–5 is moderate, 6–7 is high, and 8–10 is very high. When the index is 3 or above, you need sun protection. The Met Office issues the official UV index forecast for the UK, so checking the UK weather hub or the Met Office directly gives you the most reliable data for your location.
When is the UV index highest in the UK?
The highest UV levels in the UK occur between May and August, especially on clear days around midday. The peak month is usually June, when the sun is highest in the sky. Even on cloudy days, up to 80% of UV rays can penetrate cloud cover, so you cannot rely on cloud alone for protection. Check the 10 Day Weather Forecast UK to plan ahead.
What is the highest UV index ever recorded in the UK?
The highest UV index recorded in the UK is 10, which occurred in southern England during a clear summer day. This level is classed as “very high” and requires full sun protection, including SPF 50+ sunscreen, a hat, and sunglasses.
Does the UV index change by month in the UK?
Yes, the UK UV index varies significantly by month. It is 0–1 in winter (November–February), rises to 3–5 in spring (March–May), peaks at 6–8 in summer (June–August), then drops back to 1–3 in autumn (September–October).
What is the UV index today in London?
The UV index today in London is shown in the live forecast above. For the most accurate reading, check the BBC Weather or Met Office app, as UV levels can change rapidly with cloud cover and time of day.