‘雷雨’ literally combines ‘雷’ (léi), meaning ‘thunder’, and ‘雨’ (yǔ), meaning ‘rain’. Together, they form a compound noun meaning ‘thunderstorm’—a weather event characterized by both lightning, thunder, and heavy rain. Unlike English, where ‘thunderstorm’ implies the full phenomenon, 雷雨 in Chinese often emphasizes the sudden, intense, and sometimes brief nature of summer storms common across much of China.

This word is widely used in weather forecasts, news reports, and everyday conversation to describe stormy conditions. It carries no emotional connotation—it’s neutral and factual—but frequently appears in safety advisories or travel updates. While 雷 and 雨 can appear separately, 雷雨 functions as an inseparable lexical unit; you wouldn’t say *‘雷的雨’ or *‘雷+雨’ with a pause or modifier between them without changing meaning or sounding unnatural.