While retailers experienced a slowdown in sales activity this summer, a new survey shows that consumers are readying their wallets for autumn spending.

Almost one-third of respondents said they planned to spend $300 or more on items like clothing, home decor, home office and school supplies this fall, while 16 percent intend to shell out at least $500. Most consumers will buy clothing this fall, followed by back-to-school gear for themselves and their children.

Still, consumers worry about spending too much. One in five consumers report having trouble staying within a budget, while 22 percent purchase more than they need.

“Fall is one of the highest shopping seasons of the year,” said Margo Georgiadis, executive vice president and chief marketing officer of Discover Financial Services. “Consumers want to make sure they’re spending their money wisely as they prepare for this busy time of the year.”

Discover Card surveyed 1,031 adults nationwide by telephone in July.