Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Public Journal weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The UV index for London, shown in the live forecast above, is currently moderate, meaning sun protection is needed if you are spending time outdoors. The UV index is a standard measure of the strength of ultraviolet radiation from the sun – the higher the number, the greater the risk of skin and eye damage.
What does the UV index scale mean?
The UV index runs from 0 (night-time) to 11+ (extreme). A reading of 1–2 is low, 3–5 moderate, 6–7 high, 8–10 very high, and 11+ extreme. In the UK, the UV index rarely exceeds 8, but on clear summer days it can reach 7 or 8 in southern England. Always check the UK weather hub alongside the live forecast to see how local conditions affect your UV exposure.
When is the UV index highest in the UK?
The UV index is strongest between 11am and 3pm from late spring to early autumn. The UK’s highest recorded UV index is around 8, typically seen in the South East on sunny June afternoons. By month, the average UV index peaks in June and July, dropping to near zero in December and January. For a tailored view, the 10-day forecast includes UV estimates for your area.
What does a UV index of 6 mean?
A UV index of 6 means the risk of harm from unprotected sun exposure is high. You should reduce time in the sun between 11am and 3pm, wear SPF 30+ sunscreen and reapply every two hours, and cover up with a hat and sunglasses.
Do I need sunscreen on a cloudy day?
Yes – up to 80% of UV radiation can penetrate light cloud cover. Even on overcast days, the UV index can be moderate. Check the UV index today UK and the live forecast for guidance; if the index is 3 or above, sun protection is advised.
Can you get sunburn in the UK in winter?
It is very unlikely. The UV index in winter months across the UK is typically 0 or 1. However, if you are skiing at high altitude or near reflective snow, the UV index can be higher, so protection is still needed in those specific circumstances.