Parents and pupils at Llanrumney High School will gather outside the Senedd later to protest against its planned closure.
Yesterday, the Welsh Government's consultation which sought views on whether the school in Cardiff should close this August ended.
The school was put into special measures by the school inspectorate Estyn last year. A previous proposal was to close the school in August 2014 but the Welsh Government is looking to bring that forward to this summer.
The suggestion is that all pupils attend Rumney High School instead, or another school that parents prefer.
The move has been met by opposition with more than 550 people signing a petition against the plans. Campaigners say the move "will effect the pupils education and their confidence."
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Mainly dry with lengthy clear spells overnight and just a few showers likely, especially in the north and west.
Ysgol Uwchradd Caergybi became the UK's first comprehensive 65 years ago. Academies are now dominant in England, but certainly not in Wales.
Dry for most, but a few showers likely.