This is a tempting time to stand with the hose and spray everything because it is so dry out there. Instead try to conserve water supplies and watch for signs that your plants truly need to be watered. Water plants when they wilt, especially if wilted in the morning. This is because end of the day wilting can be normal for plants to conserve their water supply.
When watering apply 1 inch of water per week to give them a good soaking. One deep watering is better for your plants to build a more resilient root structure than several shallow waterings. Early in the day is best so that the plant's leaves have a chance dry before temperatures drop in late afternoon.
Keep in mind that after watering (or rain) is the perfect time to weed, they pull right out!
(excerpt from PrairieGarden Garden Journal: The Guide)