Now is the winter time in Brisbane, but the lowest degree in Winter time is just only around 7-8 degree. Thus, we cannot see the snow at all.
However, you can go to SkatingAt Festiva to have a snowy winter.
From today to 22nd July 2017, a giant ice rink and ice slide have setup in King George Square. I believe you can skate in there. But you need to pay the entry fee, Adult $28, Children (8 to 13-year-old) $20, Kid (3 to 5-year-old) $10.(Buy online ~20% off).
Also, there are some food trucks next to the ice rink. They offer some hot foods, which is the best for the cozy winter.
That sounds cool, I think you should not miss this event.