ABSTRACT Although firms suffer from regional climate risk in their production and operation, they are still highly expected by the public to play a leading role in addressing regional climate risk. In this paper, we study how regional climate risk affects corporate social responsibility (CSR). By constructing regional climate risk indicators and employing the OLS method to conduct empirical analyses, we find that regional climate risk can significantly promote CSR. Furthermore, regional climate risk can suppress firm’s cash flow, thereby exerting internal pressure on firms to assume CSR. Meanwhile, regional climate risk can raise higher public expectations for firms, imposing external pressure on them to assume CSR. We suggest that external pressure from the public plays a dominant role in CSR decision-making. Besides, we confirm that CSR can achieve a win-win goal for both firms and the public by mitigating the damage of regional climate risk on the firm’s long-term performance. We provide a new perspective for studying firm’s motivation to assume CSR under the influence of regional climate risk.