Sydney has clocked its wettest July on record despite being just halfway through the month, with more rain expected to be dumped on the city in the coming weeks.

As of 9am on Thursday, Sydney’s Observatory Hill weather station reported 342.2 mm of rain since the start of the month, making this July the wettest in history with records dating back to 1858.

The previous wettest July was 1950 with 336mm. The usual average rainfall in July for Sydney is 96mm.

Weatherzone senior meteorologist Brett Dutschke said La Niña had been a “major player” in the amount of rainfall recorded in Sydney this year.

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“Even though La Niña has now fizzled a bit, we are in a new phase,” he said.

Despite already breaking the history books, Dutschke said the record was likely to be smashed with more rain expected to fall in Sydney for the rest of the month.

Dutschke said this was due to the combination of an unstable weather system developing offshore, warmer than normal water also sitting offshore, and colder than normal air passing above.

This combination means we won’t see another long spell of dry weather until August, he said.