Many people notice a curious weather trend: heavy rain pours through the night, only to ease just as the morning commute begins. Meteorologists explain that this is often due to the diurnal cycle - the daily rhythm of atmospheric heating and cooling. During the day, sunlight warms the ground, triggering convection and afternoon thunderstorms. At night, without the sun’s energy, the atmosphere stabilizes, but cooling air can still hold enough moisture for rainfall, especially in humid or coastal regions.

In tropical and monsoon climates, sea–land breeze interactions can intensify night and pre-dawn showers. However, as the sun rises, surface heating resumes, altering air pressure and wind patterns, which often disperse clouds and reduce precipitation. In many inland areas, lingering storms from the previous evening simply lose strength by morning.

This pattern isn’t universal, but in regions with strong daytime heating and nighttime cooling cycles, it’s a recurring rhythm - making early morning skies surprisingly clear despite the night’s downpour.