GfK's forward-looking poll of around 2,000 consumers forecast an increase of 0.2 points to reach 10.6 in July, continuing an upward trend observed over the past two months.
"Germans see the domestic economy in excellent shape into the beginning of the summer," the firm commented in a statement.
"Even uncertainty about possible restrictions on trade by the US government or the start of Brexit negotiations can't cloud the picture for now," they went on -- although both could be troubling prospects for citizens of Europe's export powerhouse.
Low interest rates have contributed to people's inclination to spend over saving, the survey found, while a stronger labour market has boosted confidence.
"Low levels of fear for their own jobs means consumers can plan more securely. That makes them ready to take on bigger purchases with higher financial risks," the pollsters said.
Consumers' positive mood matches that of businesspeople, after the monthly Ifo survey of entrepreneurs mounted to its highest level since 1991 in June.