average temperature south lake tahoe early september
Weather in South Lake Tahoe in September. The average maximum daytime temperature in South Lake Tahoe in September is a comfortable 20Â°C (68Â°F). There are usually 11 hours of bright sunshine each day, which represents 85% of the 12 hours of daylight. Expect 21mm (0.8 inches) of rainfall across the whole of September with 4 days with some rain falling.