Poonamallee experiences a warm and humid climate year-round, with temperatures rarely dipping below 20°C. Winters are mild, with average highs in the mid-30s, while springs bring increasingly hot days that can soar into the low 40s by April. Summers remain sweltering, with temperatures consistently above 35°C from May to July, before gradually cooling down in autumn. The coolest months are typically December and January, but even then, nights rarely drop below 20°C. Overall, Poonamallee's climate is characterized by warm days and relatively cool nights throughout the year.