Most people think it's healthier for the plants to water in the morning, Greg. The reason, and this applies especially in humid climates but is true everywhere, is that leaving the foliage wet over night is an invitation to fungal infection. If you're able to just flood the soil and root zone, it's not so bad.
Another good reason to water in the mornings is to minimize evaporation. Not such a big concern where you are, I know, but for instance in Utah where I help out in my daughter's garden, the air is so dry and the soil is so hot in the evenings, a lot of the water evaporates before it can reach the plants' roots. Early in the mornings, everything has had all night to cool off so the least evaporation happens.
