A group of parents in Gwynedd are keeping their children away from Ysgol Groeslon for the day to stage a protest at the condition of the school.
Gwynedd County Council has had to condemn parts of the building, which means that some classes will have to be taught - possibly at the same time - in the school hall.
The council says the move to the hall is an interim measure until a 'temporary classroom unit' for Year 3, 4, 5 & 6 pupils is installed in two weeks time.
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A chilly start to the day is expected but prolonged spells of sunshine will allow the temperatures to respond, highs of between 14 - 17 °C