"Such fluctuations happen, rates move in zigzags. Everything will fall into place," the president told reporters in Istanbul.
The lira fell to 7.2775 against the dollar on Thursday, reigniting fears about the country's high external debt and the central bank's shrinking liquidity.
Erdogan said the national economy had become healthier since his party came to power in 2002 and blamed "enemies abroad" for stoking fears inside the country.