UV Index
UV Index
Today's UV index in Belfast, United Kingdom 
will be up to 5.6, 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: 2025-06-01
With a UV index reaching up to 5.6 in Belfast, 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.
Belfast's UV index is usually low to moderate, ranging from about 1 in winter to 5 or 6 in summer, due to its northern location and often cloudy skies. This means the sun's rays are not very strong most of the year.
Belfast has cool, wet winters with temperatures around 0-8°C and mild summers, averaging 15-20°C. Rain is common year-round, with the wettest months typically from October to January. Snow can happen in winter but is not heavy.
Compared to other parts of the UK, Belfast is cooler and wetter than much of England but milder than inland Scotland. It is windier and rainier than Dublin, Ireland, which lies just across the Irish Sea and has slightly warmer temperatures.
See the UV index hour by hour for Belfast, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.