A reminder washed out games are rescheduled by the association.
The kings weekend (5-8th June) and middle of July school holidays (10-13th July) are both set as washout reset weekends along with 14-17th August weekend.

Generally if a couple of games are washed out they are played mid week and slotted in where ever suits, however if a majority of clubs washout for that particular round it is usually rescheduled for one of the above rescheduled dates.

We got Round 5 games on this weekend at Miller Park but If your Round 5 game was washed out at an away venue; I would expect it will likely be reset for the Kings Birthday weekend.
If Round 6 washes out this weekend it may too be set for the Sunday of the Kings Birthday Weekend or potentially for the July weekend.
Once I have any concrete information I can let you know, otherwise you may find out on Squadi as soon as I do with a change of date for your teams individual games.