The Aussie dropped 1.8 percent to US$1.0187 and reached US$1.0152, the weakest level since July 13. It lost 0.9 percent to ￥80.14.
Meanwhile, the New Zealand dollar, nicknamed the kiwi, depreciated 1.5 percent to US$0.8180. It touched US$0.8153, the lowest since Sept. 11.
The Dollar Index, which Intercontinental Exchange Inc uses to track the greenback against the currencies of six major US trade partners including the euro and the yen, fell 0.8 percent to ￥79.336 this week in New York. It touched ￥79.103 yesterday, the lowest since Sept. 21.
The US dollar dropped 1.4 percent to US$1.3045 per euro, after gaining 0.9 percent in the five days ended on Sept. 28 and rising 1.2 percent the previous week. The 17-nation currency gained 2.4 percent to ￥102.57. The Japanese currency depreciated 0.9 percent to ￥78.67 to the US dollar.