<p>Using observations, reanalysis and modeling datasets, the potential impact of Quasi-Biennial Oscillation (QBO) on North Pacific sea surface temperature (SST) is investigated in this study. We found a close relationship between QBO and North Pacific SST at the interannual timescale in February–March. During positive QBO events (i.e., the westerly phase of QBO), negative SST anomalies form in the central North Pacific while positive SST anomalies occur along North American coast in February–March, similar to the positive phase of the Pacific Decadal Oscillation (+PDO). Our analysis indicates that during +QBO events, a westerly anomaly occurs in the tropical lower stratosphere, which arches down into the subtropical troposphere over the North Pacific and thereby leads to westerly anomalies there. The subtropical westerly anomalies favor a negative GH (cyclonic circulation) anomaly north of it via the positive vorticity forcing of zonal wind shear. Through the friction of wind and the Coriolis force, this atmospheric cyclonic circulation anomaly forces southward/northward ocean current anomalies in the central/north-to-east North Pacific, which contribute to the +PDO-like SST anomaly via cold/warm temperature advection. Meanwhile, the atmospheric cyclonic circulation anomaly associated with QBO induces PDO-like surface latent and sensible flux responses via modulating wind speed and temperature and water vapor advection, also favoring the +PDO-like SST anomaly. These results are supported by air-sea coupled simulations from CMIP6 high-top models. The impacts of –QBO events on North Pacific SST are overall opposite to those of +QBO events. Additionally, due to the periodicity of QBO, the PDO-like anomaly in February–March is also significantly correlated with the QBO indices in preceding December and January, suggesting that the QBO index is a useful predictor of PDO-like SST variations one to two months in advance.</p>