UV Index
UV Index
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Today's UV index in London, United Kingdom 
will be up to 2.7, indicating low risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
Today, the UV index suggests low sun danger (0-2) in London, reaching up to 2.7. Remember sunglasses and SPF 30+ on sunny days, and be cautious around reflective surfaces like sand, water, and snow for increased UV exposure.
Read more here about the climate and sun exposure in and around London.
The UV index in London can vary throughout the year, with higher values typically occurring from April to September. On a scale from 0 to 11+, London's UV index can reach values of 6 (moderate) to 8 (very high) during summer months. This means taking precautions against sunburn and skin damage is important, such as wearing sunscreen, sunglasses, and a hat when outdoors.
London experiences four distinct weather seasons. Spring (March to May) brings mild temperatures ranging from 9 to 15 °C (48 to 59 °F) and occasional rain showers. Summer (June to August) is generally warm with temperatures averaging between 15 and 25 °C (59 and 77 °F), though heatwaves can push the mercury higher. Autumn (September to November) sees cooler temperatures around 9 to 16 °C (48 to 61 °F) and more frequent rain. Winter (December to February) is typically cold, with temperatures ranging from 2 to 8 °C (36 to 46 °F) and occasional snowfall.
Compared to its southern England region, London experiences a slightly milder climate due to its urban heat island effect. However, it still maintains a similar sun exposure pattern. The region experiences an average of 1,480 hours of sunshine per year, with the sunniest months being May to July. Despite this, London's weather can be quite changeable, so it's always advisable to check the forecast before planning any outdoor activities.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in London. It's designed to provide you with a better understanding of the yearly weather and sun exposure.