The extended rain forecast issued by the Indian Meteorological Department has also made it clear that there would not be any above normal rainfall scenario in the coming two weeks
"Generally cloudy sky with a few spells of rain or thunderstorms is the forecast of July 9," said Regional Meteorological Centre, Thiruvananthapuram.
Kerala used to get around 64cm rainfall in June during a normal monsoon, but it has recorded only 40.7cm so far.
Kottayam records highest rainfall of 9cm, followed by Kannur (8cm)
Speaking to The New Indian Express, board chairman N S Pillai said though the dams had good inflow after the pre-monsoon showers, the water level in all reservoirs is well below peak storage capacity
Earlier, the IMD had forecast that the monsoon would arrive in Kerala on May 31, while private forecast agency Skymet said it expected the monsoon to reach Kerala coast early by two days on May 30.
Due to strengthening of lower level southwesterly winds, fairly widespread rainfall activity with isolated heavy falls are very likely over northeastern states during next five days.
The catchment areas of many dams in the central Kerala districts have reported heavy rains, prompting the authorities to sound alert warnings before upping their shutters.
The heavy rain that has been lashing the state for the past two days has triggered fears of a flood and hundreds have taken shelter at relief camps as low-lying areas have been inundated.
The sea turned rough and tidal waves rose one metre high, displacing many families in the coastal areas and fully or partially damaging houses.
Though a cyclone is likely to form over Arabian Sea, the tropical storm is expected to vacate the Indian region by May 22.
The Indian Meteorological Department has sounded orange alert across the state barring Thiruvanathapuram, Kollam, Pathnamthitta, Kannur and Kasaragod warning heavy to very heavy rains on Friday.
Alphons Kannanthanam today turned down the demand of Congress leaders to declare Kerala flood as a "national calamity" and said there was no provision in the Disaster Management Act 2005 to do so.
About 10,000 people are likely to be rescued by Monday in Kerala where rain-induced floods have claimed over 200 lives in the last 10 days, officials said.
Kerala floods HIGHLIGHTS: CM Pinarayi Vijayan says 33 lives lost on Saturday; death toll rises to 357
Torrential rains, overflowing rivers and a series of landslides have resulted in the death of over 150 people in the state in three days.