A lifeguard shortage across the region will leave Sand Hills Beach in Scituate unattended this summer. “We certainly want folks to be aware,” said Town Administrator Patricia Vinchesi. Meanwhile, Minot, Peggotty, and Humarock beaches should have lifeguards seven days a week from 10 a.m. to 5 p.m., and Egypt Beach on Saturdays and Sundays from 10 a.m. to 5 p.m. Though lifeguards are generally scheduled during those times, the staffing is subject to change. Alterations to the schedule will be posted at the beaches as well as on the town’s website, www.town.scituate.ma.us. Scituate and other coastal communities on the South Shore have been struggling to find lifeguards from now until Labor Day. Even if beaches are not staffed, they will still be open to the public, officials said.