It is good and constant so long as its the autumn of 2002. Which it's not. Ah, remember those six weeks? The best surf Teignmouth has ever had. It rarely works now, last time it was good was about a year ago on the sandbar, the waves used to come around in a big bowl section and dump you in the deep water. Happy memories.
I'm a local and come to Teignmouth what ever the wave. Recently the swell has been quite good having a whole week of surf and two clean days. The best time to get in is in the morning when it's off shore. Teignmouth can hold some great powerful waves at high tide and usualy surfed by spongers. Some banks can appear giving some excellent hightide heavy peaks.
Picks up all south and east swell but is much better with big a south westerly. Best either side of mid tide, but watch out for the rips. Take care with the groins and the pier, especially when it starts to dump at high tide. It holds up to 4 foot. The sandbar can barrel at times.
To be honest with you this beach only performs a few days a year and when it does on a south westerly all the deprived locals will be out in flock! If you do get a good day look to surf the right from the pier or get tubed off the sand bank!