CHENNAI: The next few days are going to get hotter as a heat wave has hit the interior parts of Tamil Nadu . There is no forecast of summer rain.Interior Tamil Nadu experienced a heat wave on Saturday. The Met department has forecast maximum temperature of 34°C in Chennai on Sunday.It was fluctuating between 32°C and 33°C in the past few days. The maximum temperature was at 40°C in Karur Paramathi while it was 39.6°C at Salem. Forecast says the temperature will be higher by 2°C in the districts..