Just as this is the hottest period of the Northern Hemisphere,it is also the coldest for the S.Hemisphere. And the coldest spot on the globe was at the Amundsen Scott Station on the South Pole. On July 23rd,it recorded a minimum temperature of -77.7°c. Do not even try to imagine the intensity of the cold !These are extremes of the globe ,the other extreme being +48°c recorded at Basrah(Iraq)on 26th.July.A difference of 125°c between the two extremes !

Monsoon:
As mentioned,the "low" is likely to form over the bay in a day or two,enhancing the rainfall over central India and Mumbai from Friday.With the system deepening,Mumbai may get a few thundershowers on Saturday.