MOSCOW, April 29 (Reuters) - The Russian rouble weakened against the U.S. dollar on Monday with low liquidity and activity due to Russia's May holidays.

At 0715 GMT, the rouble was 0.47% lower at 92.83 to the dollar.

Against the euro, the rouble fell 0.62% to 99.52 and dropped 0.27% to 12.73 against the yuan .

Brent crude oil, a global benchmark for Russia's main export, fell 1.1% to $88.51 a barrel.

Russian stock indexes were mixed. The dollar-denominated RTS index fell 0.39% to 1,177.64. The rouble-based MOEX Russian index gained 0.12% to 3,470.17.

(Reporting by Reuters; Editing by Alison Williams)