A chance of showers comes late Tuesday, with the chance of thunderstorms and showers lasting until Saturday, according to the National Weather Service (NWS) in Reno. Weekly forecast for South Lake Tahoe from NWS Reno:MondayMostly sunny, with a high near 88. Partly sunny, with a high near 81. Partly sunny, with a high near 77. Thursday NightA chance of showers and thunderstorms before 11pm, then a slight chance of showers.