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High snowfall events on Thwaites Glacier (West Antarctica) are a key influencer of its mass balance, and can act to mitigate sea level rise contribution related to ocean warming-induced ice loss. We use the output of a high-resolution regional climate model, RACMO2, in conjunction with MERRA-2 and ERA5 atmospheric reanalyses for the period 1980-2015 and show that there is a pronounced seasonal cycle in snowfall over Thwaites Glacier. We find that the total annual snowfall does not correlate significantly with the Southern Annular Mode (SAM) or ENSO, but it does relate to the zonal wave three pattern over Antarctica through the coupling of the Amundsen Sea Low with a blocking high over the Antarctic Peninsula during high snowfall events. Our results highlight that atmospheric circulation and consequent high snowfall events on Thwaites Glacier are highly variable, and recognizing their future change will aid to improve predictions of mass balance.