🇮🇳 Chennai vs 🇮🇳 Mumbai

Chennai's tropical wet-and-dry climate is defined by its long Bay of Bengal coastline, which delivers the northeast monsoon from October to December — the city's primary rainy season, unusual for an Indian metro. The flat coastal plain offers little topographic relief, so microclimates are driven primarily by proximity to the sea, river corridors along the Adyar and Cooum, and dramatic variation in building density and green cover. Summer temperatures routinely exceed 40°C inland while coastal neighborhoods benefit from steady onshore sea breezes that moderate heat by 3–5°C.

Tropical monsoon — hot and humid year-round, extreme monsoon season

Mumbai has one of the world's most dramatic monsoon seasons. The southwest monsoon (June–September) dumps enormous rainfall, regularly flooding the city. The dry season (November–February) is the time to visit with warm but manageable conditions.