Super flat on the northern side. Small chop on southern side. Depending on tide there is a current flowing in the channel. Works on all tides but best at high tide.
The beach is narrow at high tide. Launch off the end of the sandspit. No real issues with the launch except the strong wind. Beach is mostly sand with a few shells. Entry is by 3 methods: 1) launch from southern side and sail round the point. 2) walk 500m along the spit from Glendowie and launch from end (best option). 3) sail across estuary from Buckland Beach side. This works great at low tide but watch current and ferries and moored yachts.
Water temp is 15°C in winter, 23°C in summer. Best seasons are winter and summer. A wetsuit is necessary in case you get into trouble in the channel. Air temps are similiar to water temps but in winter the southerlies that work great here bring cooler than average temps so it won't be warm.
This spot only suits wind over 20 knots. Best direction is SW to SSE which occur during winter and also during summer along with the occasional 15-25 knot thermal. The strong westerlies common in spring are the wrong direction for this spot. In winter the southerlies work great here.