Bharananganam experiences a Tropical Monsoon climate (Köppen classification *Am*). The weather is generally warm, humid, and equitable throughout the year, with temperatures typically ranging from 22°C (71°F) to 34°C (93°F).
The village receives abundant rainfall, primarily governed by two monsoon seasons: the Southwest Monsoon (Edavappathy), which brings heavy downpours from June to August, and the Northeast Monsoon (Thulavarsham), bringing afternoon thunderstorms in October and November. Humidity remains high year-round. The best time to visit is during the relatively cooler and drier winter months, from December to February.