Mannar's climate is characterized by a warm and humid environment throughout the year, with temperatures rarely dipping below 18°C or rising above 37°C. The summer months of March to June see a gradual increase in temperature, peaking at an average high of 39°C in June, while the winter months of December to February experience slightly cooler temperatures, averaging around 27°C. The period from July to September is marked by relatively stable temperatures, hovering around 30°C on average. April and May are also warm with temperatures averaging around 30°C. Overall, Mannar's climate is mild, with minimal temperature fluctuations throughout the year.