Actually, I do much better than that...my summer plants are deliberately located next to a shed which blocks all afternoon sun. That isn't what causes the fruit set problem, however. It is caused by high nighttime temps, temps exceeding 75 deg. I haven't found a way to cool off the plants at night.
There is zero fruit set from sometime around late June to mid-September here. Then in mid-Sept, we sometimes get lucky, and a front knocks the nighttime temps back below 75 deg. If you have plants in bloom at that time, you get rewarded.
It takes 20 to 30 days following fruit set to get ripe tomatoes. We start getting ripe tomatoes again late Oct. to early Nov. and until frosts.