The town enjoys a tropical climate, the monsoons start in June. The months of April–May can get pretty humid. The best weather is from October to February. Pathanamthitta experiences three distinct seasons: summer, monsoon and winter. Typical summer months are from March to May. The warmest month in Pathanamthitta is April. Although summer doesn't end until May, the city often receives locally developed heavy thundershowers in May (although humidity remains high).
The monsoon lasts from June to August, with moderate rainfall. Most of the heavy rainfall in the city fall between June and July, and June is the wettest month of the year. Last weeks of June is also days of floods. The three major rivers viz Pampa, Achankovil and Manimala swell with rainwater.
Winter begins in December. December through February are the winter months. The lowest temperatures are experienced during January
