No, the speed of sound in a given medium does not change depending on the day. The speed of sound is determined by the properties of the medium through which it travels, such as temperature, density, and elasticity. In general, the speed of sound increases with an increase in temperature and decreases with a decrease in temperature. However, these changes are relatively small for normal variations in daily temperatures.
Other factors that can affect the speed of sound include humidity, atmospheric pressure, and the composition of the medium. However, these factors also do not typically vary significantly on a day-to-day basis to cause noticeable changes in the speed of sound.
Therefore, for practical purposes, the speed of sound is considered relatively constant and does not change significantly depending on the day.