Well after a 30 second search i found this...
tomfraser wrote:
Use a map mate. If you have had Easterlies for a couple of days dive the East side of the bay. Beaches that are facing West will have good visibility if there is consistent Easterlies involved.
In terms of the back beaches, there is a bit of both swell and winds involved. If offshore winds aren't ridiculously strong they will push the swell down a little. Onshore winds act to increase swell and also dirty up the water. Offshore winds clean up the water conversely.
In the bay you should watch out for onshore winds. If you have strong Westerlies, you should not dive at Mornington, try the west side of the bay.
If you experience northerlies for a couple of days, dive the back beaches if the swell is good. If you experience easterlies, dive the East side of the bay such as Mornington. If you have southerlies, the only real places you can go are the Southern end of the bay such as Portsea/Sorrento. In the case of Westerlies, head out West.
The key is to try and dive places that have experienced offshore winds for visibility. You should also keep in mind the terrain you are looking to dive. A lot of places in Mornington for example have clay cliffs. If they experience heavy rains then chances are it will be very dirty (the clay runs off into the water).
You just have to keep an eye on the weather and woirk out where the most suitable place will be to dive. Join the club and make dive buddies that you can call and ask where the best vis is.
It even talks about the place('s) u want to go...
Also never said that "everyone" was wrong or vague just pointing out that those 2 comments made were not very accurate. If You (being new) went on those comments solely you'd be sitting at home going ah it rained yesterday i better not go spearing or ah its over 17km/h i better not go ...
Maybe have a read and then if you need anything clarified ask questions about the things that you don't understand.
Stick at it mate you will work it out, takes ages to work out the weather. Also you can use the PM function if you want specific info on a certain place that someone may not be willing to divulge on the public side of the forum. Or attend a club meeting (i'm not a club member etc, only use this forum) I hear that its the best way to learn everything you need to know.