​Pest Management Association of New Zealand vice president Dr Paul Craddock said flies were climate-driven creatures with a life cycle of about a week.
"My prediction would be, the fly season is going to go pretty crazy. We're going to see a lot of flies around, and also mosquitoes and other general insect activity like ants.
"There's going to be a lot of standing water around in drains and places like that, so mosquitoes are going to be particularly bad."
While it was hard to predict exactly how bad the season would be because of localised conditions, Craddock - an entomologist - said people should expect many more flies buzzing around their house.
"Generally speaking, it's going to be worse than usual."

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