You are very lucky Rita. We don't usually get rain from June-Sept. I say usually because for the last two years we have had rain through June.
Water either too much or too little most certainly affects my tomato plants and fruit development depending on where they are in their growth pattern.
Weather can affect them also, too hot or too cold will slow them down. We all have differnet growing conditions so not everything will work for everyone.
http://www.ehow.com/info_84996...
http://www.bhg.com/advice/gard...
Scroll down near the bottom and read under "Other Tips"
http://extension.oregonstate.e...
