The U.S. dollar was sold at 26,300 rials on the unofficial Iranian market on Tuesday compared with 24,750 rials on Sunday, the Mehr news agency reported.
The pound and the euro were also traded at 42,500 rials and 33,900 rials, compared with 40,300 rials and 32,500 rials, respectively.
An ounce of gold was sold at 1767 dollars in international markets.
The Central Bank allowed trading in its currency at market levels after fixing the exchange rate in January as the threat of sanctions over the country's nuclear program and economic risks spurred Iranians to buy dollars.
The bank on Jan. 26 fixed the rate at 12,260 after the U.S. dollar surged to almost double that level in unofficial currency markets.
