Brisbane woke up to its coldest May morning in more than a decade on Wednesday, with chilly temperatures expected to blast the south-east until the weekend.

The Bureau of Meteorology forecaster Adam Blazak said Wednesday had been Brisbane's coldest May morning since 2006, with the mercury plummeting to 7.7 degrees.

Cold temperatures records for May tumbled around the state on Wednesday, in particular Bundaberg, where it was 5.5 degrees – the coldest May day for more than 50 years.