UV Index
UV Index
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Today's UV index in London, United Kingdom 
will be up to 4.6, indicating a moderate level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
With a UV index reaching up to 4.6 in London, stay shaded during midday when the sun is strongest; wear protective clothing, a wide-brimmed hat, UV-blocking sunglasses; apply SPF 30+ sunscreen every 2 hours, even on cloudy days; and be cautious of heightened UV on bright surfaces.
The UV index in London typically ranges from low to moderate, with levels rarely reaching high. It's influenced by the city's northern latitude and tendency for overcast skies.
London experiences four distinct seasons, each with its own weather characteristics. Spring brings mild temperatures and blooming flowers, while summers are generally warm and sometimes see heatwaves. Autumn features crisp air and colorful foliage, and winters are often cold and damp, with occasional snowfall.
Compared to its region and neighboring countries, London is relatively mild. Its weather is influenced by the North Atlantic Drift, a warm ocean current that moderates temperatures. Cities further north or inland, such as Edinburgh or Paris, usually have colder winters and hotter summers.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in London. It's designed to provide you with a better understanding of the yearly weather and sun exposure.