THIRUVANANTHAPURAM: The state will receive isolated heavy rains today and tomorrow. Due to depression over the Bay of Bengal, heavy rains are likely in the southern districts. The central districts will also receive medium rainfall. As the strength of depression decreases after tomorrow, the rain may also lose strength. The IMD has not issued alert. Fishermen in southern districts are advised not to venture into sea due to the possibility of high waves along coast and rough sea.