Slow, frequent waterings when the sun is low: this is the way to go. There’s no point losing moisture to evaporation caused by wind or midday heat. The goal is for every drop of precious water to soak deep into the ground, so that new roots will pursue it just as deeply and thus form a stronger, more drought-hardy base than shallow root systems offer.
Still, every now and then it’s nice to tip the nozzle up into the sunlight and admire the wisp of rainbow you’ve conjured.