This study assesses the contributions of extreme and non-extreme rainfall events to seasonal precipitation over Northwest India (NWI) and examines the underlying dynamical mechanisms. Our analysis reveals a notable increase (10 %) in overall seasonal rainfall of NWI during 2000–2023 period relative to 1971–2000. In addition, we also found that extreme rainfall events (EREs; R90s) have contributed more than 75 % of the total seasonal rainfall over majority of NWI, with some regions (Punjab, Haryana, Rajasthan and Gujarat) extending the contributions beyond 90 %. Our comprehensive analysis implicates planetary scale atmospheric circulation as the key driver during EREs. Specifically, the Rossby wave induced trough elongation from Europe played a dominant role. This was modulated by the negative configuration of the East Asian Polar and Subtropical Jet streams, which eventually facilitated downstream propagation. The resulting wave pattern featured an amplified barotropic ridge over the North Pacific, a distorted positive phase of the Pacific-North American (PNA) pattern, and a ridge (trough) over North Atlantic Ocean (Europe). This European trough slowly descended from upper to lower levels, elongated and merged with the pre-existing low over NWI. Such synoptic configuration enhanced the moisture transport from the equatorial Indian Ocean and Arabian Sea into NWI by strengthening the low-level jet and sustaining deep convection, leading to rainfall extremes. In concordance, the features of CAPE, Cloud base heights, Low level Cloud liquid water content, enhanced convergence and Moist Static Energy underscore the dominance of vigorous convective precipitation over NWI in the post 2000 period. These findings have severe implications for hydrological and ecological sectors.