Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Norwich Wire weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The UV index in London, shown in the live forecast above, measures solar ultraviolet radiation intensity on a 1-to-11+ scale. Today’s value indicates the risk of skin and eye damage from the sun, ranging from low to extreme depending on conditions.
What does the UV index scale actually tell you?
The UV index scale runs from 1 (low) to 11+ (extreme). A reading of 1–2 means low risk, with no protection needed for short outdoor periods. At 3–5 (moderate) and 6–7 (high), the NHS advises sunscreen, sunglasses and shade. Values of 8–10 (very high) and 11+ (extreme) require extra precautions, including avoiding the sun between 11am and 3pm.
For reference, the UK weather hub shows that southern England typically sees moderate to high UV values between April and September. The 10 day weather forecast UK includes UV index predictions for planning outdoor activities.
When is UV highest in the UK?
The UK UV index by month follows a clear seasonal pattern. From November to February, values rarely exceed 1–2. UV rises from March onwards, peaking between May and August when readings of 6–8 are common across southern and central England. The highest UV index in the UK is typically recorded in June and July, when clear skies can push values to 8 or 9 in London and the South East. Cities further north, such as those covered by Glasgow Weather and Sheffield Weather, see slightly lower peaks due to latitude.
What is the UV index today in the UK?
The UV index across the UK today varies by location, cloud cover and time of day. Check the live forecast above for London, or refer to the UV index Met Office forecast for your area. Values are typically highest between 11am and 3pm from April to September.
What is the UV index scale and how should I use it?
The UV index scale tells you how strong the sun’s UV radiation is and when you need to protect your skin. At UV 3 and above, the NHS recommends sunscreen (SPF 30+), sunglasses and shade. Use the scale alongside the weather forecast to plan your day safely.
When is the best time to check the UV index?
Check the UV index around midday (11am–3pm) when values are at their peak. The UV index today UK BBC forecast and Met Office updates provide hourly predictions, helping you decide when protection is necessary for outdoor activities.