During day temperature is high and weather is humid and prepaining such condition is known as October heat. The typical Oct and Nov remain a phase of gradual change from the rainy and hot weather to a dreary winter. Visible skies and rising temperatures properly mark the gradual retreat of the monsoon.

Why does the temperature get higher during the day?

Let's start by considering the energy coming from the Sun. Between sunrise and sunset, the radiation from the Sun is continuously adding more energy to Earth's surface. If this energy didn't escape somehow, the temperature would be warmest at sunset.

In which time of a day the temperature is very high?

Body temperature normally fluctuates over the day following circadian rhythms, with the lowest levels around 4 a.m. and the highest in the late afternoon, between 4:00 and 6:00 p.m. (assuming the person sleeps at night and stays awake during the day).