UPDATE 1-Peru's finance minister revises down 2018 growth

(Adds data on investment, growth; rewrites throughout; adds context)

LIMA, Aug 14 (Reuters) - Peru's economy will likely grow 3.8 percent to 4 percent in 2018, the country's finance minister said on Monday, a significant downward revision from his April estimate of 4.5 percent due to the lingering effects of floods and a graft scandal.

Fernando Zavala, who is also the Andean nation's prime minister, said the government will make "all possible efforts" to end 2017 with growth of 2.8 percent, adding that the government has fiscal space to support the economy.

Private investment should grow 3.5 percent next year, he projected. This June, the economy likely grew 3.6 percent, he said, while July and August growth will likely come in at more than 2 percent.

Peru's economy experienced an unexpected slowdown early this year due to severe flooding and the fallout from a massive graft scandal involving Brazilian builder Odebrecht.

In an interview last week, Peruvian President Pedro Pablo Kuczynski told Reuters that recovering internal credit and increasing prices for copper and gold would likely boost economic growth in the coming months. (Reporting by Marco Aquino; Writing by Gram Slattery; Editing by Chris Reese and Meredith Mazzilli)