The marine layer, a common weather phenomenon in Southern California known for creating 'May Grey' and 'June Gloom,' is reportedly diminishing. According to CBS LA's Marina Jurica, this coastal cooling effect, which typically brings cooler temperatures and overcast skies to the region, is becoming less frequent. The marine layer plays a crucial role in moderating temperatures along the coast, providing relief from the inland heat. Its disappearance could lead to warmer conditions and increased heat days, impacting the local climate and lifestyle.