<p>A limited number of studies suggest that consumers tend to give unpleasant online evaluations on rainy days because of bad mood. However, how social influence, a vital source of consumers’ evaluation bias, affects the negative effect of rainy weather remains underexplored. To investigate the interaction effect of review volume and rainy weather on consumers’ online restaurant ratings, multiple linear regression analyses and online experiments were conducted. Our results show that review volume can mitigate the negative effect of rainy weather on online ratings, which is mediated by consumers’ conformity tendency. We experimentally find that rainy weather decreases online ratings by inducing consumers’ negative mood. The effect of negative mood is also attenuated by review volume, with consumers’ conformity tendency serving as the underlying mechanism. Our study contributes to the literature by emphasizing the role of social influence in the exploration of weather effects and uncovering psychological mechanisms that shape consumers’ behavior under such influences.</p>