By Leika Kihara and Tetsushi Kajimoto

TOKYO (Reuters) -Japan's economy rebounded at a slower-than-expected pace in the second quarter from a COVID-induced slump, data showed on Monday, highlighting uncertainty on whether consumption will grow enough to bolster a much-delayed, fragile recovery.

A revival in Japan, like many other economies, has been hobbled by the Ukraine war and surging prices of commodities even as rising consumption propped up growth in April-June.

"Consumption and capital expenditure will continue to drive growth in July-September. But momentum may not be that strong as rising inflation is cooling household spending," said Atsushi Takeda, chief economist at Itochu Economic Research Institute.

"While domestic demand may continue to expand, falling exports could put a brake on Japan's recovery," he said.

Indeed, Japan's outlook has been clouded by a resurgence in COVID infections, slowing global growth, supply constraints and rising raw material prices that are boosting households' living costs.

The world's third-largest economy expanded an annualised 2.2% in April-June, government data showed, marking the third straight quarter of increase but falling short of median market forecasts for a 2.5% gain.

It followed a revised 0.1% rise in gross domestic product (GDP) in January-March, when surging COVID cases hurt spending.

The growth was driven largely by a 1.1% gain in private consumption, as restaurants and hotels saw demand recover thanks to the lifting of pandemic-related curbs.

Capital expenditure, another key driver of April-June growth, increased 1.4% from the previous quarter, exceeding a median market forecast for a 0.9% expansion, the data showed.

But the rise in second quarter consumption was smaller than market forecasts for a 1.3% increase, casting doubt on whether the rebound in household spending will have legs.

EXTERNAL RISKS

Some analysts say a resurgence in COVID infections, and recent price hikes for a wide range of daily goods, could discourage households from splurging on leisure and dine-outs.

Wage earners' remuneration during April-June, adjusted by inflation, fell 0.9% from the previous quarter, a deeper drop than a 0.1% fall in January-March in a sign rising living costs were already hurting household income.

Heightening fears of a global slowdown, driven in part by a wave of monetary tightening by major central banks, have also darkened prospects for a sustained recovery in Japan's economy.

While domestic demand added 0.5% point to April-June GDP, external demand neither added to, nor shaved off from growth in a sign of waning support from the once-strong export sector.