Kalmunai's climate is characterized by warm temperatures throughout the year, with minimal seasonal variation. The dry season, which spans from January to April, brings average temperatures ranging from 27-30°C, with March often being the hottest month. Summer months of May and June see temperatures rise even higher, sometimes reaching up to 36°C. The wet monsoon season begins in July, but its impact on temperature is minimal, as temperatures remain steady at around 30°C until September. Autumn months from October to December experience a slight cooling trend, with average temperatures ranging from 28-29°C.