Summer (June-August): Peak tourist season with warmest weather (15-20°C/59-68°F) and longest daylight hours (sunrise 4:30am, sunset 10pm). The Edinburgh Festival Fringe in August transforms the city into the world's largest arts festival with thousands of performances. Accommodation prices peak and booking is essential. Expect crowds at major attractions but incredible atmosphere.
Spring (March-May): Increasingly popular with mild weather (8-15°C/46-59°F), blooming gardens, and fewer crowds than summer. Cherry blossoms in Meadows Park and Royal Botanic Garden are spectacular. Easter weekend is busy. Good balance of pleasant weather and manageable tourist numbers.
Autumn (September-November): Excellent time to visit with comfortable temperatures (10-16°C/50-61°F), beautiful fall colors in parks, and fewer tourists after September. September still busy with late festivals. October offers atmospheric misty days perfect for exploring haunted sites. November is quiet with shorter days but lower prices.
Winter (December-February): Cold (2-7°C/36-45°F) with short daylight hours (sunrise 8:30am, sunset 3:45pm) but magical atmosphere. Edinburgh Christmas Market and Hogmanay (New Year celebrations) are world-famous. Snow possible but not guaranteed. Lowest prices and smallest crowds January-February. Indoor attractions ideal. Dress warmly in layers.
Best Overall: May-June or September offer optimal weather, manageable crowds, and reasonable prices. August is unmissable if you love festivals but book early and expect premium prices.