Temperature expected to touch a maximum of 43ºC in internal areas
The euro changed hands at $1.1949, having strengthened to its highest level since May 2018 in the previous session.
Sterling edged above Tuesday's eight-month high of $1.3241, last quoted at $1.3255.
"There is a strong momentum for investors to want to sell the dollar," said Juntaro Morimoto, an analyst at Sony Financial Holdings, pointing that the greenback has been declining since last month.
Although the dollar often functions as a safe-haven investment in times of crisis, it has fallen since the Federal Reserve's intervention into financial markets to maintain liquidity in the midst of the Covid-19 pandemic.
The Fed's programmes have pushed risk assets to all-time highs and reduced demand for safe-havens, even as economic data has painted a bleak picture of the US recovery.
In commodities market, a softening dollar kept gold elevated, with spot gold last trading at $2,002.1 per ounce.
An agreement over a new round of federal stimulus spending remained elusive, although US House of Representatives Speaker Nancy Pelosi said on Tuesday that Democrats in Congress are willing to cut their coronavirus relief bill in half to get an agreement on new legislation with the White House and Republicans.
Providing additional headwind for the dollar, President Donald Trump on Tuesday said a big shift to mail-in voting in the November presidential election could cause so many problems officials might have to re-do the vote.
On the data front, Japan's official data on exports fell 19.2 per cent in July from a year earlier, beating economists' forecast of 21 per cent decrease, while the country's core machinery orders fell 7.6 per cent in June from the previous month.
Against the yen, the dollar last sat at 105.17 yen.
Investors await the release later on Wednesday of the minutes from the July 28-29 FOMC meeting, with speculation the Fed will adopt an average inflation target, which would seek to push inflation above 2 per cent for some time.
The risk-sensitive Australian dollar traded near $0.7255, while the kiwi last bought $0.6611.
Temperature expected to touch a maximum of 43ºC in internal areas
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