September is the most popular time to visit Glendalough, as the region comes alive with vibrant spring blooms and ideal weather for outdoor activities. The peak season runs from July to September, attracting visitors who are eager to enjoy the picturesque landscapes and tranquil lakes that Glendalough is known for.During this time, you can expect mild temperatures ranging from 10 to 20 degrees Celsius, making it great for hiking and exploring the scenic walking trails. The pleasant climate encourages guests to take part in activities like picnicking by the lakes or visiting the historic sites, all while soaking up the natural beauty of Western Australia.For those seeking a more budget-friendly option, consider planning your trip in May. This month offers a quieter experience, with fewer tourists and the chance to enjoy the stunning autumn colours without the crowds. You'll still find plenty of opportunities for exploration, whether it's wandering through serene nature reserves or enjoying leisurely strolls along the paths.Ultimately, your choice of when to visit Glendalough will depend on whether you prefer the lively option of the peak season filled with outdoor adventures or the calm and beauty of the shoulder months, ideal for a more peaceful retreat.