Experts and BHG readers answer.
Yellowing lawn: firstname.lastname@example.org
In your climate, with its high heat, even established lawns need water 2-3 times a week. A new lawn would need it daily for the first month or so, then cut it back to every other day. Seems to me that every other day is a pretty typical schedule for watering lawns in your area.
The yellowing may very well be due to nitrogen deficiency, which could be worse than it normally would be due to all the watering, which tends to leach nutrients out of the soil. So, you could apply a little fertilizer (try it at half the package rate) and see if the lawn responds with better color -- you'll see improvement within a few days if that's the issue.
Watering should take place in early morning, so that the grass dries quickly as the day heats up. That will reduce diseases.
Water your shrubs similarly -- every day for first month, then cut back to every every other day. Just keep an eye on it and if it starts to look really swampy or muddy all the time, cut back your sprinkler run times until it dries out some.