Havasu Falls in July

March through May offers the sweet spot — moderate temperatures and flowing waterfalls fed by snowmelt. Fall (September through November) works too, with warm days and cool nights perfect for camping. Summer is brutal with temperatures hitting 110°F in the canyon, though the pools provide relief. Winter brings unpredictable weather and potential trail closures. The waterfalls flow strongest in spring after winter storms. But here's the catch — permit availability often dictates your timing more than ideal weather. Take whatever dates you can get, then plan accordingly. Pack layers regardless of season since desert temperatures swing wildly between day and night.