The S&P CoreLogic Case-Shiller home price index rose more than expected in August, hitting an all-time high.

National home prices continued to rise in August, reporting a 6.1 percent annual gain on the S&P's most broad indicator. This was better than the 5.8 percent increase expected by economists polled by Reuters.

"Home price increases appear to be unstoppable," S&P Dow Jones indexes managing director David Blitzer said, before adding that national "home prices have reached new all-time highs."

The latest report was a gain from the 5.9 percent increase in July.