Hi Phil
In short, that is a good time to head up. Even better in Oct/Nov IMHO. The NE winds normally come & it is getting a bit warmer too

(not that you will feel our cool). Having said that, like anywhere you get your on/off days, luck of the draw really. Hervey Bay is very nice sailing but Burrum River has to be low tide & SE winds for the spped strip (if thats what you want).
Jeffro