Deepavali often coincides with the peak of the northeast monsoon, leading to varying weather conditions across Tamil Nadu. According to the India Meteorological Department (IMD), thunderstorms, lightning, and gusty winds are common during this period. While some districts may experience heavy rainfall, cities like Chennai often see short spells of rain or thunderstorms, with temperatures ranging between 25°C and 31°C. This variability can make planning outdoor celebrations challenging.