UK house prices rose 0.7 per cent in September to beat forecasts for a dip to 0.4 per cent.
September's gain came after a rise of 0.6 per cent in August.
On the year, however, house price inflation eased to 9.0 per cent from 9.6 per cent in August - the slowest rate since last October. The average house price stood at £184,723 (€262,669).
The figures corroborate other recent property surveys that suggest house price inflation is cooling in response to the Bank of England's five interest rate hikes in the last year.
Nationwide said the recent turmoil in financial markets did not appear to have had any impact on the property market this month, although it could soften further out as lenders were set to tighten conditions in response to a rise in market rates.
A crunch on global credit markets sparked by banks' worries about their exposure to risky loans propelled interbank interest rates to multi-year highs as institutions became wary of lending to each other.
Lender Northern Rock, which specialises in high loan-to-value mortgages and at bigger multiples of salaries, was the first major victim of the crunch, which forced it to seek emergency funding from the Bank of England and prompted thousands of savers to withdraw their deposits.