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The baht rose 0.6 percent to 32.69 per dollar as of 0810 GMT. Thai consumer confidence in May also improved, while Moody's Investors Service on Monday affirmed the country's Baa1 credit rating with a stable outlook.
The Indian rupee eased as the central bank was spotted intervening to check appreciation in the best-performing Asian currency so far this year, traders said.
The rupee came off lows briefly after the Reserve Bank of India left its key policy rate on hold, and eased rules to spur bank lending.
The Indonesian rupiah hit its weakest in more than three months, leading losses among emerging Asian currencies, after the country on Monday reported a large trade deficit in April.