Regular feeding is also necessary in this period. Feed your lawn with a high-nitrogen lawn feed, in early to mid summer, to promote a vigorous growth, preferably using a liquid formula that have a quick effect. Some granular formulations have longer-lasting action to feed the grass the whole season. If your lawn is having other difficulties it is better to use triple-action solution: lawn feed, weed and mosskiller. In late summer stop using the high-nitrogen fertilizer, as the vigorous growth will not stand up to the rigors of the winter. In this period use instead a high in phosphates fertilizer to promote root growth and to toughen up the grass for the winter.
Water the lawn on dry periods only if is absolutely necessary. If you have started a new lawn this spring, either from seed or turf, it is vitally important not to let it dry out over the summer period because if this happen it will never recover the way it was.
Spike heavily compacted areas with a fork to relieve compaction or use a hollow-tined aerator, sweeping up the soil cores left on the lawn then brush sand or gritty compost into the holes.
In mid to late summer start preparing the sites for sowing or laying turf for new lawns in early autumn. For a leveled surface it is better to give as much time as possible to the soil to settle. Prepare the sites by digging and removing any perennial weeds, then level it roughly. Live then the soil for a few weeks to allow annual weeds to germinate and then hoe them off.