Answer: If your rosemary is growing in containers, the problem might very well be that direct sunshine hitting the containers is baking the roots. Try sheltering the containers from direct sunshine. If it is planted in soil and is on a roof, the drainage might be a little too fast so no matter how often you water, most of the water is running off too fast. If this is the case, you can make a watering well or basin around each plant to hold more water. The light green leaves do indicate some stress so the sooner you can determine what it might be, the better off your rosemary will be.
Good luck with your garden!
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