SOUTH LAKE TAHOE, Calif. – Fall officially started last Monday, and the temperatures and forecast will be very fall-like in South Lake Tahoe. South Lake Tahoe forecast from NWS Reno:MondayA chance of showers before 11 am, then showers likely and possibly a thunderstorm between 11 am and 2 pm, then a chance of showers and thunderstorms after 2 pm. Southwest wind 5 to 10 mph. SaturdaySunny, with a high near 65. SundaySunny, with a high near 64.