Today, the UV index suggests low sun danger (0-2) in Bilbao, reaching up to 1.5. 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 Bilbao.
The UV index in Bilbao can vary throughout the year, with higher values typically experienced during the summer months. In July and August, the UV index can reach levels of 8 or 9, which is considered very high (possible ouchies!). It is recommended to protect your skin by wearing sunscreen, hats, and sunglasses when the UV index is high to prevent sunburn and other harmful effects.
Bilbao experiences distinct seasons, with mild winters and warm summers. In winter, temperatures can range from around 8 °C (46 °F) to 14 °C (57 °F) during the day, dropping to 4 °C (39 °F) to 8 °C (46 °F) at night. Spring and autumn bring pleasant temperatures ranging from 12 °C (54 °F) to 20 °C (68 °F) during the day, and between 6 °C (43 °F) to 14 °C (57 °F) at night. Summers are warm, with temperatures ranging from 21 °C (70 °F) to 27 °C (81 °F) during the day, and around 15 °C (59 °F) to 19 °C (66 °F) at night.
Compared to its region, Bilbao enjoys a relatively moderate climate due to its coastal location. The Bay of Biscay helps to regulate temperatures throughout the year, keeping summers cooler and winters milder than inland areas. However, while the region enjoys a fair share of sunshine, it is essential to be mindful of the UV index, as excessive exposure can still result in sunburn and other sun-related risks.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Bilbao. It's designed to provide you with a better understanding of the yearly weather and sun exposure.