Principal Weatherbee began the school day by announcing their plans to continue moving forward with the pep-rally, despite recent events. As Sheriff Keller spoke on the status of Jason Blossom's death, Weatherbee briefly noticed Archie Andrews lurking outside his office.
Later that day, he approached Archie, requesting that they speak for a moment. He first acknowledged Archie's satisfactory position within the school, such as Varsity football and AP music tutorials. He quickly moved on to the real reason he requested Archie's presence, the look they shared earlier that day, he wondered why Archie wouldn't meet his eyes, suggesting that he may be hiding something about Jason.
That night, during thePep Rally, he hands the mic over to Mayor McCoy. The next day, he and Sheriff Keller arrest Cheryl Blossom during class due to something that was revealed during Jason's autopsy. 
Principal Weatherbee and Sheriff Keller escorted Cheryl to his office for question in the murder of her own brother, Jason Blossom. Cheryl claimed that she didn't kill Jason, however, she admitted to lying about what took place on the 4th of July. The truth is that they went out there to fake Jason's death. They made it to the other side of Sweetwater River, in Greendale, and they parted ways, but she recalled hearing a gun shot just before.
The following day, Archie came forth, admitting that he was at the river on the 4th of July, and that he heard a gunshot. Weatherbee watched quietly as Sheriff Keller did the interrogating. The only thing useful they learned from Archie was that Cheryl's claim of gun fire is true. 
Jughead Jones was taken into custody upon the discovery made by Sheriff Keller, which were that his fingerprints were on file for a previous incident. After entering The Blue and Gold in search for Jughead, Weatherbee and Keller found his murder board, which only made matters worse. 
Homecoming and Jubilee
Principal Weatherbee denied Betty Cooper's request to delegate a percentage of her decorating duties for the Homecoming to Ethel Muggs. She made a commitment, one that she had to honor, especially when considering that this Homecoming was also reunion weekend, in which former graduates would return to Riverdale High School to revisit their youth and make up for lost time. The night of the dance, Mr. Weatherbee and Mayor McCoy requested Betty's assistance throughout the evening, however, she was fairly unavailable, leaving the task of walking Mayor McCoy up to the stage on him.
Following an altercation between Jughead Jones and Cheryl Blossom in the school's cafeteria, Mr. Weatherbee requested Jughead's presence in his office, where he interrogated him over the murder of Jason Blossom, before letting him go. Later that night, he called Fred Andrews, and suggested that Jughead finish the rest of the semester from home as he was concerned with Jughead's safety after the incident with Cheryl. The other students could react in a similar fashion which would cause unwanted problems.
At Mayor McCoy's request, Mr. Weatherbee called Archie Andrews and Betty Cooper down to his office, where they discussed the opportunity of the two teens being featured as the town's heroes at the 75th Anniversary Jubilee. They helped bring peace and justice to their streets once more, and even though that's not exactly what happened, Betty claimed, Weatherbee urged her to allow the Mayor to finish her proposal. A couple days later, he attended the Jubilee, and following the performance of Josie and the Pussycats and Archie, he clapped along with the rest of the crowd as Betty gave her speech pertaining to the crossroads Riverdale was facing.
Mr. Weatherbee is a middle-aged, tall man with a lean but fit build. He has a shaved head, brown skin and dark brown eyes. Weatherbee has only ever been seen during his work hours, where one would be expected to dress in a professional matter, in his case, dark colored suits. It is currently unknown what his everyday clothing choice consist of.
While very little is known of Mr. Weatherbee's personality, he appears to be fairly stern and straightforward. Under the impression that Archie Andrews was withholding information pertaining to the death of Jason Blossom, Weatherbee was frank in approaching him by asking Archie if he had any knowledge of Jason's case.