You can check the tide tables to give you a rough idea of the conditions at the boatclub (taking an appropriate delay into account for the travel time between the station you use and the time it takes the tide to get from that station to the boat club.
I use the new westminster tide levels and add 60 to 90 minutes to have an idea of water levels at the boatclub.
Disclaimer - If you want to use data about tides you do so at your own risk and are responsible for your own actions. So be sure to read the disclaimer on the website that you use..
Here is a link to the site for the plot below http://www.dairiki.org/tides/daily.php/nwm
click on images to enlarge them
And here are several photos taken at the boat club around 9:20 p.m. You can see from the plot above that low tide is around 8:00 p.m. and that (for this day) the photos taken at the boatclub 80 minutes later (9:20 p.m. ) show the lowest tides I think I have ever seen..
