Brisbane is swapping silly season for a soggy one, with rain forecast to fall on the city almost every day in the next 28 days.

Weatherzone meteorologist Robert Wood said Brisbane was in for a soaking, with between 150mm and 200mm expected to fall between now and New Year's Eve.

Brisbane's gloomy weather forecast. Credit:Weatherzone

The wet weather would remain until at least January 3, according to its 28-day forecast.

There were only four days in December where Brisbane had a low chance of rain and two days that would be "average".