The best time to go to Irun is during the shoulder seasons of May, June, September, and early October. These months offer pleasant weather, fewer crowds, and a good balance for exploring the region.During May and June, the weather is typically warm and sunny, ideal for walking and enjoying the outdoors without the intense heat of mid-summer. You'll find the local festivals starting up, and the countryside is lush and green. This period is particularly good for those who enjoy hiking or exploring the coastal paths nearby.September and early October also provide comfortable temperatures, superb for sightseeing and day trips. The summer crowds have thinned out, making it easier to visit attractions and find restaurant reservations.