How frequently are you mowing? How fast is the grass growing? If you are removing a large part of the blade, you will see that lower on the blade might not be as green as the top part of the blade. As you gradually lower your cutting, I believe that you will see the green lower on the blade. If your grass is growing vigorously as a result of the rains, you may need to mow more frequently than once every 7 days.
As far as watering, with all the rain we have had, I can't see adding anymore water. If you do water, try to go at least 7 days before watering and then give it a good slow drink. I'm sure you've read about the 1" watering measuring. Follow that. I have not watered my lawn at all this year. I have St. Augusting, Bermuda, and Tall Fescue.
Keeping it clean and green here, Boss.
Reduce, Reuse, Recycle