The ideal time to visit Great Britain is between late spring and early autumn, from May to September. Spring brings mild weather and blooming flowers, making it a great time for events like the Chelsea Flower Show. Summer offers the warmest temperatures, perfect for festivals and long days, though it can attract larger crowds at popular attractions. Autumn, with its colorful foliage, provides a quieter experience for exploring the countryside and attending local harvest festivals. Winter, though colder (0°C to 8°C/32°F to 46°F), has its own charm with festive lights and Christmas markets.
In Ireland, the best time to visit is also from late spring to early autumn, particularly May to September. Spring brings fresh greenery and mild weather, making it ideal for outdoor activities and exploring Ireland's stunning landscapes. Summer offers the longest days and pleasant weather for coastal drives and sightseeing, though popular tourist spots can be busier. Autumn, with its rich fall colors, offers a quieter and more relaxed experience for touring the countryside.