残暑

1. Origins, structure, and basic meaning

• Structure: It is read ざんしょ. 残 contributes remaining and 暑 heat, forming a word for summer heat that lingers as summer ends or gives way to fall.
• Basic usage: It describes heat that continues despite the season moving on. In the example, lingering heat in September keeps a parasol necessary.
  • 九月に入っても残暑が厳しく、日傘が手放せない。

2. Common pitfalls and similar expressions

• Intensity versus seasonal timing
  • 猛暑 emphasizes extreme intensity, while 残暑 emphasizes summer heat lingering into a later part of the season. Lingering heat can also be intense, as expressed by 残暑が厳しい.