The global strike is taking place at Guildhall Square from 1pm.
SDLP Leader Colum Eastwood, who is taking part in the strike, commended the young people for taking action.
The Foyle MLA said: "It is fitting that young people are leading the charge, they will be here after we have gone and they have a real opportunity to do something no other generation has done in history; to leave the world in a better condition than they got it in.
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"We should be doing everything possible to help them achieve this but sadly some important legislative changes required to strengthen environment protection here in Northern Ireland cannot be made in the absence of an Assembly.
"The time for action is now. The SDLP is prepared to invest in bold initiatives to repair the damage we've done to our natural environment. Action on climate change will be a key part of our agenda at Westminster and at home."
(CM/MH)
