UV Index
UV Index
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Today's UV index in Belfast, United Kingdom 
will be up to 4.3, 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 4.3 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.
The UV index in Belfast, UK, is generally low due to its northern location. On average, the UV index reaches 4.5 in the summer months and rarely exceeds 6.
Belfast experiences four distinct seasons. Spring (March to May) is mild and wet, with temperatures ranging from 7°C to 14°C. Summers (June to August) are cool and damp, with temperatures rarely exceeding 20°C. Autumn (September to November) is often mild and wet, while winters (December to February) are cold and damp, with temperatures occasionally dropping below freezing.
Compared to its region and neighboring countries, Belfast's weather is milder than continental Europe's and colder than southern UK and Ireland. Its proximity to the Atlantic Ocean results in a milder climate, with less extreme temperatures than inland areas. Rainfall is moderate and evenly distributed throughout the year, making Belfast wetter than its neighbors to the south.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Belfast. It's designed to provide you with a better understanding of the yearly weather and sun exposure.