Heavy to very heavy rainfall occurred at various parts of Alapuzha district with Mavelikkara recording 13 cm, while Alapuzha, Haripad and Kayamkulam recorded 9 cm rainfall, Indian Meteorological Department (IMD) Director, S Sudevan, said here.
Vadakara (Kozhikode) and Koni (Pathnamthitta) recorded 7 cm of rains, he said.
"However the rains have been comparatively less in the hilly areas of the state," Sudevan told PTI.
Neyyatinkara and Varkala in Thiruvananthapuram district also received heavy rains.
Very heavy rainfall is likely to occur at one or two places in Kerala tomorrow, an IMD bulletin said.
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IMD had earlier in the day said that the southwest monsoon hit Kerala and the northeast, two days ahead of the scheduled arrival of the crucial seasonal rainfall.
Cyclone Mora, which hit the Bangladesh coast today, aided the advance of the monsoon, director general of the India Meteorological Department K J Ramesh said.
The normal onset date for the monsoon in Kerala, which marks its official arrival in the country, is June 1.