You didn't mention which type of grass you have and various species respond at different rates to the warming temps. I would not worry about watering if the soil feels moist now in your area. When temps really begin to warm up you can start watering periodically. In the heat of summer once or twice a week is plenty often in full sun. Apply 1/2 to 1 inch when you water. A rain gage can guide you as to how long you must run a sprinkler to apply this much water.
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