Obama's August total -- more than $114 million between his campaign and the Democratic Party -- marks the first time the incumbent president has out-raised Romney since his challenger secured the GOP nomination in April.
Romney's haul, through a joint fundraising effort with the Republican National Committee, totaled $111.6 million. Both campaigns released their finance figures early Monday morning.
It is the first time this election season that Obama raked in more than $100 million in one month. Romney has done so for three consecutive months.
"The key to fighting back against the special interests writing limitless checks to support Mitt Romney is growing our donor base, and we did substantially in the month of August," Obama campaign manager Jim Messina said in a statement, pointing to the campaign's more than 1.1 million contributors in August, who gave an average of $58.
The Romney campaign did not release its total number of contributors, but did say that more than 820,000 donations received were in increments of $250 or less.
"Mitt Romney and Paul Ryan are offering bold solutions to our country's problems -- that is why we are seeing such tremendous support from donors across the country," Romney finance chairman Spencer Zwick and RNC Chairman Reince Priebus said in a statement.
The Romney campaign ended August with $168.5 million in the bank; the Obama camp did not reveal how much cash it has on hand.
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