Edinburgh's climate is most comfortable for the traveler from May to September.
That said, the weather in Edinburgh is always changeable and visitors should expect both sunshine and rain, whatever the season. Edinburgh tends to get windy while it rains as well, so be sure to pack either a raincoat or a sturdy umbrella! Many a tourist has abandoned an inverted umbrella due to the persistant, whippign winds.
Summer, the main festival season, combines long daylight hours with lengthy evenings (being so far north, it rarely gets dark before 10 or 11 at night!). Winter can be bitterly cold, with short daylight hours, but Edinburgh has an abundance of indoor attractions and activities that make the cold winter days fly by. In other words, bring a coat big lad, will ya?
Travelers should note that Edinburgh becomes overwhelmingly crowded (accommodation-wise) during the main festival periods of high summer (August to early September) and Hogmanay (around New Year's Day / 1 January). Visitors at these times should plan well ahead (even more than a year in advance!) for booking central accommodation and event tickets at these times.
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