Light to moderate rainfall will continue in the state from Thursday to Monday under the influence of a low-pressure area over the southwest Bay of Bengal.
The Met Department has predicted isolated heavy rains for four days from Friday.
The prohibition would not apply to Sabarimala pilgrims or travel related to the pilgrimage or disaster relief.
Fire Force shifted over 300 families to safe locations, relief camps were opened in several schools.
According to reports, houses in Thekkumoodu Bund Colony, Gowreesapattom and Murinjapalam are flooded.
The Kerala State Disaster Management Authority has asked the public to exercise extreme caution to avoid untoward incidents.
Heavy rain to continue in Kerala till November 25.
Thunderstorms with lightning accompanied by gusty winds speed reaching 30-40 kmph is very likely to occur till Thursday.
Pathanamthitta, Ernakulam and Idukki districts have been placed under yellow alert for five days.
A yellow alert was sounded in Thiruvananthapuram, Pathanamthitta, Idukki, Palakkad, Malappuram, Kozhikode, Wayanad, Kannur and Kasaragod districts.