Remote influences on anomalous rainfall over North, Central and South Vietnam during extended summer (May-October) are explored using a 38-year (1979-2016) global dataset. Composites of wet and dry events with lags of up to two weeks are assembled for rainfall indices over these three subregions. The moisture budget and the large-scale dynamics associated with these events are described. The moisture budget for composite precipitation events is examined using vertically integrated moisture flux convergence, vertically integrated tendency and evaporation. Variations are mainly explained by the flux convergence, which is seen to serve as a reasonable proxy for intraseasonal variability in rainfall. Rainfall extremes of opposing signs show markedly asymmetrical large-scale precursors and different pathways of influence. Wet and dry events in North and Central Vietnam are seen to originate from Europe and propagate at high latitudes. The exact nature of the precursors is sensitive to the definition of the composite index. There is also a pathway of influence along the Asian jet, which impacts South Vietnam, especially for wet events which often coincide with dry events in the north. South and Central Vietnam are also influenced by tropical divergent precursors, which are again asymmetric between wet and dry events.