Lake Titicaca in January

April through September gives you the driest weather and clearest skies. This is peak season, so expect higher prices and more crowds, especially on Isla del Sol. May and June hit the sweet spot - dry weather, fewer tourists than July-August, and perfect visibility for photography. Mornings are crisp but warm up nicely by 10am. Nights drop to near-freezing, so pack layers. July and August bring the most visitors but also the most reliable weather. Every day feels like a postcard - brilliant blue skies and mirror-calm water. Book accommodations well ahead during these months. September offers shoulder season benefits - good weather with fewer crowds. Local festivals pick up too, including the Spring Equinox celebrations on Isla del Sol. Avoid October through March unless you enjoy daily afternoon thunderstorms and muddy trails. The rainy season turns dirt paths into slippery nightmares, and boat schedules become unreliable. Plus, clouds often hide the surrounding peaks that make this place so spectacular.