For most Perth dive sites you want low swell and easterly winds. If the graph is green, it will be nice.
Guide: green good, red bad. Arrows wind, line swell. Tap graph for more. This is the weather for Mettams Pool.
Underwater visibility is harder to predict. Here's what divers have reported this week:
See the full list here, or view the map below.
Tap the bubbles for more information, then tap the popup text to see site details and vis reports. Log in to make your own reports.
The data behind this site is open for analysis and can be used to explore how wind, swell, and other factors affect underwater visibility (see this analysis). You can also see how the weather forecasting code works (see how this is coded).