The most common reference rate for Finnish home loans, the 12-month Euribor, rose to 2.93 percent on Tuesday.
On Monday, it was still 2.74 percent.
"The 12-month Euribor recorded its sharpest daily jump since 2008," Nordea's chief analyst, Jan von Gerich, posted on messaging platform X on Tuesday.
"In an uncertain market environment, Euribor rates can be volatile, but such strong upward pressures on interest rates are not typically seen. Developments in the Middle East are now also shaping the path of Euribor," von Gerich said.
The European Central Bank decided at its meeting last week to leave its key rates steady.
Yle News' All Points North podcast explored risk and opportunity in the Finnish housing market.
