I’ve done either or depending on my schedule. When I’m not working I tend to water everyone outside that needs it around 6am. It takes me a couple of hours because of course I find other things that need doing also
If I’m busy and don’t have time in the AM then I water in the evening.
As long as I’m not overhead watering and splattering everyone with mud it hasn’t caused a problem.
Our summers tend to be hot and dry and every year it gets hotter and drier.
A short decade ago June was a rainy month.
We haven’t had a drop of rain in over a month now.
I’d say if it’s hot and dry to water when you have the time and just avoid mid day or super late evening.