Nights in the Indian region now baking in Heat Wave:
As the Heat Wave continues in the Sub-Continent, I see  new "highs" in the minimum temperatures.In the chart from IMD for 18th.April, if we observe the lows, they were as much as +12c above the normal in Jammu, and +11c above normal in Hissar.Many other places report minimums at +4 to +8c above normal.
Jammu  Max:38.7 (+06)    Min: 30.6 (+12)
Hissar   Max:44.1 (+07)    Min:30.8 (+11).    
Yesterday, on 18th, the highest day temperature of 46.5c was recorded at Daltongunj. And several places were at 45c.

My forecast for Monday thru Wednessday would be: North would see some rain in the most Northern hilly states, due to a weak upper level W.D. For the South, rain/thundershowers in southern Karnataka coast, not much rain inland for Karnataka next 3 days.Bangalore may not recieve rain thru this period. Rain in Kerala will be fairly good, but diminishing on Wednessday.I estimate the rain to lessen as I see winds along the South-West coast turning North, indicating a high forming in the Arabian Sea.
The North-East rains should continue thru this period (Monday thru Wed.). West and Central regions will be dry and hot. Maximums of 45/46c could be recorded in Rajasthan and Vidharbh.