Weather forecast Today: The India Meteorological Department (IMD) Monday predicted heavy rainfall at isolated places over coastal Tamil Nadu, Puducherry and Karaikal. Dense fog is very likely in isolated pockets over Assam and Meghalaya during morning hours, the IMD said in its latest forecast. A fresh western disturbance is approaching the extreme northern regions this week, including Jammu and Kashmir, and Punjab region, which is likely to bring down the temperatures. Leh town of Ladakh was the coldest recorded place Sunday at a low of minus 6.3 degrees Celsius, while the mercury in most parts of Jammu and Kashmir marked an improvement after plummeting several degrees below season's average over the past couple of days, a MeT department official told PTI. Meanwhile, pollution levels in Delhi-NCR dropped further on Monday with moderate winds sweeping the region. The overall air quality index (AQI) in the national capital read 218 at 8 am, down from 234 at 4 pm on Sunday. The weatherman has predicted generally cloudy sky in Delhi with light rain or drizzle for Monday and the maximum and minimum temperature is expected to hover around 27 and 14 degrees Celsius.