3 years later, in August, 1940, shortly after her father began his second term as Prime Minister, she died of complications from peritonitis at the Hosokawa residence in Koishikawa.
三年後の昭和15年（1940年）8月、父が総理に返り咲いて間もなく、温子は腹膜炎をこじらせて小石川の細川邸で死去した。