Aley exists, in its modern form, because of summer. From June through September, when Beirut is hot, humid, and at sea level, the mountain town at 800 metres is ten degrees cooler and almost always breezy by evening. This is the busy season — restaurants full, traffic on the Beirut–Damascus road, Gulf visitors in the apartment blocks above the main street, and any hotel that exists charging its highest rates.
Off season can be cold and rainy from December through March, with occasional snow at the higher elevations above Aley. Spring (April and May) and autumn (October and November) are the best compromise for a sightseeing visit — pleasant temperatures, clear views to the coast, and far fewer crowds. The Aley Summer Festival usually runs from late July to mid-August with concerts and outdoor events along the main street.