The real puzzle is the condensation occurring after the sun was shining.
I'd expect it to occur early in the morning.
A wood frame building doesn't have much mass.
It radiates its heat to the surrounding environment at night and cools.
In the morning with showers and cooking there's warm moist air that hits the cooler inter walls and condenses.
From what you've told me I can't put my finger on a precise cause and cure.
Need to practice good moisture management. A home in Ontario wants to have a relative indoor humidity of 20 - 30%. Any more and you'll be plagued with condensation.
Upgrade the bath and kitchen fans. Make sure they're vented to the exterior. Make sure the outside vent hood has a flapper on it to prevent back drafting.
Go to the Home Ventilation Institute website to learn about how to size fans for the space and how to manage the moisture levels. Run fans during showers and cooking.
Purchase a battery powered hygrometer to measure relative humidity.
Reduce all bypass and infiltration.
Bypass are small passageways from conditioned space into ceiling assembly. warm moist air flows through these. Caulk around windows and any penetrations in the wall or ceiling assemblies.
In short you want to increase the thermal properties of walls and ceilings so heat doesn't move as quickly. You want to reduce moisture levels to 20 - 30% RH.
Does this make sense?