Answer: It really depends upon the type of grass you are growing. Some grass varieties are called cool season grasses because they grow best in cool temperatures, but then they go dormant during the hottest time of the year. When the temperatures cool down in the fall they will green up again. Warm season grasses are just the opposite; they thrive in the hot summer months and then die down when temperatures are cool. If you have a cool season type grass in your yard, no amount of watering or feeding will make it green up during the summer months.
If you think you have a warm season grass, then raking out the thatch and reseeding will help thicken it up. After dethatching you'll want to overseed the entire lawn to replace the dead grass that you've raked out.
Best wishes with your lawn!
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