Yn ystod 2021, cyrhaeddodd  Sialens Ddarllen yr Haf 21,148 o blant ledled Cymru, mewn partneriaeth â llyfrgelloedd cyhoeddus. Parhaodd yr Her i gyrraedd cryn dipyn dros hanner miliwn o blant ledled y DU wrth i gyfyngiadau symud gael eu llacio, gan annog plant i barhau i ddarllen yn ystod cyfnod anodd.
During 2021, the Summer Reading Challenge reached 21,148 children across Wales in partnership with public libraries. The Challenge continued to reach well over half a million children across the UK in 2021 as lockdowns eased, motivating children to keep reading during a difficult time.