Get ready Sydney, because you're about to cop a lot worse more than rain.

After a torrential few days of downpours last week, the warmer weather will make for perfect conditions for swarms of cockroaches and mosquitoes, according to entomologist Bryce Peters from the University of Technology, Sydney.

Mr Peters said mosquitoes require water to complete their life cycle.

"We are likely to see an increase in the number of mosquitoes due to the amount of water from the rain we've had in the last couple of days," he said.