Cyhoeddwyd y diwrnod cenedlaethol yn 2018 er mwyn anrhydeddu Cenhedlaeth Windrush yn dilyn y sgandal a ddeilliodd o bolisi "amgylchedd gelyniaethus" Llywodraeth y DU. Arweiniodd y polisi hwn at weld nifer o bobl yn cael eu dal ar gam, colli budd-daliadau a cholli mynediad at wasanaethau'r GIG.
The national day was announced in 2018 to honour the Windrush Generation following the scandal resulting from the UK Government’s “hostile environment” policy. This saw a number of people wrongly detained, denied benefits and losing access to the NHS.