UV Index
UV Index
Today's UV index in Cardiff, United Kingdom 
will be up to 5.2, indicating a moderate level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-12
With a UV index reaching up to 5.2 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.
Cardiff’s UV index is usually low to moderate, rarely reaching very high levels. It mostly stays around 2 to 5, with the highest UV index in the summer months.
In Cardiff, winters are cool and wet, while summers are mild with some rain. Spring and autumn bring mixed weather with occasional sunny and rainy days, making the climate quite changeable throughout the year.
Compared to other parts of the UK and nearby countries, Cardiff tends to have milder winters and cooler summers than places in southern England. It is wetter than many English cities but less rainy than some parts of western Ireland.
See the UV index hour by hour for Cardiff, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.