Delhi sizzled under the heat wave as tje mercury climbed to 44.6 degree Celsius on Sunday, the highest for the season after Saturday's 43.2 degrees Celsius. A Meteorological Department official said that heat wave conditions are prevailing in the national capital and suggested further rise in temperatures in the coming days. Monday is going to be hotter with maximum and minimum temperatures expected to remain at 45 and 27 degree Celcius respectively, the official said. The day temperature on Sunday was five notches above normal while the minimum temperature at 25.9 degrees Celsius was normal for this part of the season. Humidity oscillated between 68 per cent and 19 per cent.