Not sure if this is an improvement over seabreeze but the wind direction is clearer.
This is the melville water graph
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They don't make it easy do they Steve!
The one for you can be found here.
www.bom.gov.au/jsp/watl/weather/obs.jsp?graph=all_obs&station=9977
Then click on "24 hr wind". and you should get this..
It is surprising how much the humidity varies during the day... But that may be because the Mandurah station is at the marina and the humidity reflects whether the breeze is "on" or "off" shore.
Looks like the river was better this morning than the esturary.
At 10.30am 19kn with gusts to 25kn whereas the estuary was ~6-10kn with gusts of 12-15kn