Home sales increased in San Diego County in August, the California Association of Realtors announced Monday, but prices declined. Stream San Diego News for free, 24/7, wherever you are with NBC 7. San Diego County's sales figure was up 1.3% from July, but down 0.6% from August of 2024. Home prices declined in San Diego County last month. The median sale price of an existing, single-family home in San Diego County was $1.02 million in August, down from $1.04 million in July, and an increase from $1.01 million in August 2024.