THIRUVANANTHAPURAM: Meteorologists have predicted that the temperature will rise up to 39 degrees Celsius in Palakkad and Kollam districts today. The temperature will rise up to 38 degrees Celsius in the Pathanamthitta and Kottayam districts and up to 37 degrees Celsius in Thrissur. Alappuzha, Ernakulam, Kozhikode and Kannur districts will experience temperatures up to 36 degrees Celsius. A yellow alert has been declared in these districts. Although some of the districts are likely to receive rainfall in the coming days, the heat will not subside soon.