With his two older siblings off to their first day...

With his two older siblings off to their first day of school, 3-year-old Charlie Maguire had his mom, Allie Maguire, both of Stony Brook, all to himself during an outing to the Frank Melville Memorial Pond in Setauket on a pleasant late summer afternoon on Tuesday. Credit: Newsday/John Paraskevas

School’s open and September weather appears to be back in force, with clear, sunny skies Tuesday and an expected high of just 74 degrees.

As most schoolchildren were arriving for classes Tuesday just before 8 a.m., it was a cool 58 degrees, the National Weather Service said.

Daytime temperatures in the high 70s are likely all week, though Long Island could see 80 degrees Friday.

Overnight temperatures will drop into the 50s Tuesday and Wednesday and are expected to be in the low 60s on Thursday and Friday, forecasters said. 

Rain is forecast Saturday, when the weather service said showers and thunderstorms are possible. Any rain could begin early on Saturday, with thunderstorms most likely in the afternoon.

Sunday will be mostly cloudy.

A small craft advisory for all ocean waters from Sandy Hook, New Jersey, to Montauk Point ended at 8 a.m., the weather service said.

Get the latest news and more great videos at NewsdayTV Credit: Newsday

Gilgo victim update ... Convicted killer pins murders on Heuermann ... Blakeman deputies ... Deal-breakers for homeowners

Get the latest news and more great videos at NewsdayTV Credit: Newsday

Gilgo victim update ... Convicted killer pins murders on Heuermann ... Blakeman deputies ... Deal-breakers for homeowners

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