To skip a day of water to your flower pots, you must receive at least 1/2" of rain on the pots. If your pots are under a tree, a ramada, carport or patio, they are not getting rain. Keep that in mind before you decide how to proceed.
Also, remember that if your pots are accustomed to daily watering, that 1/2" of rain is only good for one day!!!
Be mindful and don't let your flowers dry out.
For more information on potted gardens in the desert, visit The Contained Gardener.