Delay lawn mowing by 24 or perhaps 48 hrs. Mowing to return a lawn to 3 inch height is no problem when the lawn grows to 4 or 4.5 inches. If a lawn reaches 5 inches, mowing to a 3 inch height stresses the turf. This is in addition to the concern over what to do with the long clippings. In general, lawns grow slower in summer due to the heat.
Kentucky bluegrass is a cool season plant and tends to languish in hot weather.
It should be possible in most cases to delay mowing with no concerns for lawn health. Plan mowing based on consideration of smog advisories plus the one-third rule, not a calendar schedule. This minimizes ozone formation by dispersing VOC and moves mowing to a time of day when temperatures are less favorable for ozone formation. Reduce lawn areas when renovating landscapes Less lawn means less mowing. Minimizing turf areas may be part of a plan to renovate an overgrown landscape, save on water costs or add a deck or other outdoor living area.