China's yuan, bucked the trend, hovering at six-month highs against the dollar after the central bank set a stronger midpoint for a second day.
The peso lost as much as 0.6 percent to 43.95 per dollar, its weakest since Aug. 13, after data showed Philippine export growth in July eased compared with June.
The peso's retreat came despite expectations that the Philippine central bank will tighten monetary policy on Thursday, which would be the fifth consecutive meeting where it has opted to tighten.
The Singapore dollar fell 0.3 percent to 1.2665 versus the US dollar, its softest since March 27, weakening past a chart support at 1.2653.
Economists have cut their Singapore 2014 economic growth forecast to a median 3.3 percent from a 3.8 percent prediction made three months ago, a central bank survey showed earlier.
The Indonesian rupiah eased on dollar demand from local corporate and as the currency turned weaker in non-deliverable forwards markets. Jakarta shares lost 1 percent.