UV Index
UV Index
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Today's UV index in Cardiff, United Kingdom 
will be up to 4.4, 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 4.4 in Cardiff, 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 Cardiff, UK, is relatively low due to its northern location. It reaches peak levels during the summer months, but rarely exceeds 6-7, which is considered moderate.
Cardiff experiences four distinct seasons, each with unique weather patterns. Winters are mild and damp, with occasional frost and snow. Spring sees mild temperatures and blooming flowers. Summers are generally cool and wet, with temperatures rarely exceeding 25°C. Autumn brings crisp air, colorful foliage, and rainfall.
Compared to its region and neighboring countries, Cardiff has milder and wetter weather. While other parts of the UK, like Scotland, see more extreme temperatures, Cardiff remains relatively stable, never getting too hot or too cold. Its climate is also milder than its European counterparts such as France, which has hotter summers and colder winters.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Cardiff. It's designed to provide you with a better understanding of the yearly weather and sun exposure.