May in Brussels typically marks a transition from spring to summer, offering pleasant temperatures and increasing sunshine. Average daytime highs range from 15C to 19C (59F to 66F), while nighttime lows hover around 8C to 11C (46F to 52F). Rainfall is common throughout the month, though generally lighter and less frequent than in earlier spring months. This period experiences an average of nine rainy days and approximately 70 mm of total precipitation. While sunshine increases significantly in May compared to April, overcast conditions can still occur.
Understanding the typical climate during this time allows travelers to pack appropriately and plan activities accordingly. The milder weather encourages outdoor exploration of the city’s parks, historical sites, and open-air markets. May avoids the peak summer tourist crowds, potentially offering a more relaxed experience. Historically, this period has coincided with the blooming of many flowers and plants, adding to the city’s aesthetic appeal. Favorable conditions for outdoor events and festivals also contribute to the vibrant atmosphere of Brussels in May.