Are you over-fertilizing, by chance? If you are fertilizing before fruit sets, lush foliage will be produced, but not fruit. Wait until after fruit sets, then give light fertilization.
Also...all of our gray and rainy days might be causing flowers to fall off--tomatoes need that sun to set fruit (i've been seeing this).
We are supposed to get some sun in the next few days, perfect tomato setting temperatures, and light winds to increase pollination. If your plants aren't under stress, or fertilized into foliar bliss (but fruit failure), I bet you will see some new fruit by late next week. Let's hope for a late frost!
After you see fruit, make sure you have protected them from blossom end rot--all this rain (or over-watering)can wash those nutrients away.
Good luck! I'm sure others wil chime in too.
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