Lalam experiences a Tropical Monsoon climate (Köppen classification: Am). The weather is consistently warm and humid throughout the year, with average temperatures ranging from 23°C to 33°C (73°F to 91°F).
The region receives heavy rainfall, primarily driven by two monsoon seasons: the Southwest Monsoon (Edavappathy) from June to September, which brings torrential downpours, and the Northeast Monsoon (Thulavarsham) from October to November, characterized by evening thunderstorms. Humidity rarely drops below 70%. The best time to visit is during the relatively cooler and drier winter months from December to February.
