The 'Thula Mazha', which usually arrives by October 1, is delayed by 26 days this time.
The northeast monsoon brings in rains mostly to Tamil Nadu, parts of Andhra Pradesh and Kerala.
No houses at Poovanchi were damaged during the 2018 floods but the people there had been living a nightmare since then.
Higher education institutions will remain closed on Monday. Several Kerala varsities too have cancelled examinations scheduled on the day.
Orange alert has been clamped on Kollam, Pathanamthitta, Alappuzha, Kottayam, Ernakulam and Idukki districts on October 11, 12 and 13.
The IMD has also informed that low depressions could develop in both the Arabian Sea and the Bay of Bengal in the span of the next two weeks.
This is the second-most delayed withdrawal of the Southwest Monsoon since 1975.
At 403 mm till Thursday afternoon, it is the maximum rainfall recorded in the month since 417.3 mm in September 1944.
A yellow alert has been declared for all districts extending from Kottayam district to the northernmost Kasaragod district.
The alert has been sounded in Idukki, Kottayam, Kasaragod, Kannur, Kozhikode, Wayanad, Malappuram, Thrissur and Ernakulam districts for the next two days.