The best time to go to Tullamore is typically during the summer months, from June to August, or in the shoulder seasons of May and September.These months offer the most pleasant weather for exploring the town and its surrounding countryside. You'll find milder temperatures and longer daylight hours, which are ideal for outdoor activities like visiting Charleville Castle, walking along the Grand Canal, or exploring the Clara Bog Nature Reserve. The summer also sees more local events and festivals, providing a good opportunity to experience the local culture.For those who prefer slightly fewer crowds and still good weather, May and September are excellent choices. The temperatures remain comfortable, and the natural beauty of County Offaly is particularly striking during these transitional months, with blooming flowers in spring and rich colours in autumn.