Queenslanders are being warned to exercise caution around ocean or river frontages on the South East coast over the coming days with king tides expected.

Transport and Main Roads Minister Mark Bailey warns novices not to get caught out by the wider tidal ranges, especially when launching and retrieving boats.

For Northerly ports such as Townsville, the highest tides of the season are expected next month, and could hit close to 4 metres in height.