Lake Tahoe warms gradually after snowmelt, with water temperatures remaining cold through May and early June. By mid to late June, the surface water becomes noticeably more comfortable, reaching the low 60s. July and August bring the warmest swimming conditions, usually between 68 and 72 degrees, depending on sunlight and wind. The warming process takes time because Tahoe is a deep alpine lake with snow-fed inflow and very clear water. Visitors planning to swim or enjoy water activities often find late June through early September to be the best period for warmer temperatures.