Susie, that's so true...you do have to take into account water from the neighbors. When I lived in the city, I had a neighbor who overwatered her over-fertilized lawn, so I had to take out some of my xeric landscaping and plant Louisiana iris!
The wind never stops here, so we use drip lines and soaker hoses for the most part. Problem is, since they are so quiet, I have to set a timer or i forget they are running. I try to water a different bed each day from 6 am to 10.
My tip was aimed more at conserving water and keeping gardeners out of the worst sun exposure--so if you miss watering some plants and notice severe wilting, by all means, water during the day! Don't make the plants wait until the next morning. Ideally, for established plants, you are watering once a week, slowly and deeply, early in the morning, and only if you have not had adequate rainfall.