More of the water you apply on a damp, cool and cloudy day will seep deeper down into the ground to your thirsty plants rather than evaporate without penetrating the soil very far.
Some plants are VERY thirsty right now (November 9, 2019) in our area (Clark County, Washington, USA) after an exceptionally dry summer and none of the heavy, steady fall rains we usually see. Even many of our native plants expect a “drink” by mid-October in our area.
Adequate water is especially important for perennials, trees and plants you may have put in the ground this summer or even this fall. And don’t forget any potted plants you normally leave outside expecting nature to keep them watered.
Not much rain has fallen in October or November, this year so far, so, giving them a drink now will help them get ready for winter.
You may even find birds, squirrels, reptiles and bigger mammals show up in your garden when you start your sprinklers. If you do, you might wish to put out some containers with fresh water for them, too.