The increase in services prices was offset by lower energy and retail inflation, according to the Ministry of Trade and Industry and the Monetary Authority of Singapore.
The core CPI excludes private transport and accommodation costs to better reflect household expenses.
The all-items inflation in Singapore rose to 3.1 percent year-on-year in May from 2.7 percent in April due to higher private transport prices.
Singapore expects its headline and core CPI to range between 2.5 percent and 3.5 percent this year.
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