Summer at Karlštejn Castle brings warm days of 22°C (72°F) to 25°C (77°F), ideal for hiking through lush Bohemian forests. From June to August, the Gothic masterpiece glows under long sunlight, inviting visitors to explore its Great Tower and Chapel of the Holy Cross. Guided tours reveal royal treasures, while nearby trails offer scenic views of the Berounka River. Picnic spots abound in the castle grounds, and local festivals in the village below celebrate medieval heritage with music and crafts. This season ensures vibrant greenery and clear skies, perfect for photography and history buffs alike.