The climate is moist and hot in the coast and slightly cool and dry in the interior of the district. The average monthly temperature is 250C. The district also gets the benefit of two outstanding monsoons as in the case of other parts of the state.
Hot season - March to May
South-west monsoon (Edavappathi) - June to September
North-east monsoon (Thulavarsham) - October to November
Dry weather - December to February
The district has 8 reporting rain gauge stations at Arookutty, Cherthala, Alappuzha, Ambalapuzha, Harippad, Kayamkulam, Mavelikkara and Chengannur as recorded in 1989. The average rainfall in the district is 2763 mm.