New figures from Eurostat have forecast that Ireland's Harmonised Index of Consumer Prices measure of inflation has risen to 8.2% in May from 7.3% in April - higher than the euro zone average.
Energy prices in Ireland are estimated to be up 6.7% in the month and up 46.2% since May 2021.
The CSO will publish the main inflation figures for May next week.
Eurostat's latest flash reading today also shows that euro zone inflation rose to yet another record high of 8.1% in May.
This will challenge the European Central Bank view that gradual interest rate increases from July will be enough to tame stubbornly high price growth.
Inflation in the 19 countries sharing the euro accelerated to 8.1% in May from 7.4% in April, beating expectations for 7.7% as price growth continued to broaden, indicating that it is no longer just energy pulling up the headline figure.
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Prices have risen sharply across Europe over the past year, initially on supply chain problems after the pandemic, then on Russia's war in Ukraine.
This suggests that a new era of fast price growth is now sweeping away a decade of ultra low inflation.
Though headline inflation is now four times the ECB's 2% target, ECB policymakers may be more worried by the rapid rise in underlying prices, which indicate that what was once seen a transitory jump in prices is now getting embedded.
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Inflation excluding food and energy prices, watched closely by the ECB, accelerated to 4.4% year-on-year from 3.9%.
An even narrower measure, that also excludes alcohol and tobacco, accelerated to 3.8% year-on-year from 3.5% in April.
Hoping to tame inflation, ECB President Christine Lagarde and chief economist Philip Lane have already flagged 25 basis point increases in the ECB's -0.5% deposit rate in July and September.
But some policymakers and economists doubt this will be enough, especially since underlying inflation is showing no signs of abating.
The problem is that once high energy prices seep into the economy, inflation broadens out and gets entrenched, eventually getting perpetuated via a price-wage spiral.
While the evidence of such a trend is not yet clear, a string of data from a jump in negotiated wages to broadening core inflation shows a growing risk.
That is why the central bank governors of Austria, the Netherlands and Latvia have all said that a 50 basis point rate hike in July should be on the table.
Klaas Knot, the head of the Dutch central bank, even argued that inflation expectations are now at the upper end of what could still be classified as anchored, indicating that households and investors could soon start to doubt the ECB's resolve to tame price growth.
The ECB will next meet on June 9 where it will formally end a bond purchases scheme at the end of June and continue to signal the rate hikes.
In a statement today, the CSO said that six of the 19 euro zone countries had a lower annual increase than the estimate of 8.2% for Ireland while 12 countries had higher rates.
Estonia had the highest estimated annual inflation at 20.1% while Malta had the lowest at 5.6%.
