Highs of 22 were also expected for Monday, which Owen said were average for this time of the year.
Multiple events are planned across the city this weekend, including the Whanganui Street Drags on Taupo Quay from 10am to 3pm on Sunday.
Whanganui Pride week also has multiple events planned for the weekend, including the Youth Fest and Pride Markets at Majestic Square on Saturday from 10am, and the Long Lunch on the Dublin Street Bridge on Sunday from 11.45am.