The weather on the beach is hotter than on the mountain because of several factors. These factors include the proximity to water, the elevation, and the exposure to sunlight.

1. Proximity to water:
The beach is usually located near a body of water, such as an ocean or a sea. Water has a high specific heat capacity, which means it takes longer to heat up and cool down compared to land. As a result, the temperature of the water remains relatively stable throughout the day. This stable temperature helps to moderate the temperature of the air on the beach, making it feel warmer.

2. Elevation:
Mountains are generally located at higher elevations compared to beaches. As you climb higher in altitude, the air becomes thinner and cooler. The decrease in air pressure at higher altitudes causes the air molecules to spread out, resulting in lower temperatures. Therefore, the temperature on the mountain is cooler compared to the beach.

3. Exposure to sunlight:
The beach is often more exposed to sunlight compared to the mountain. Sunlight provides heat energy, and the more direct the sunlight, the more heat it provides. The flat terrain and open spaces on the beach allow sunlight to reach the surface more directly and for a longer duration. On the other hand, mountains may have more shaded areas due to the presence of slopes, trees, and other obstacles that can block sunlight. This reduced exposure to direct sunlight contributes to the cooler temperature on the mountain.

In conclusion, the weather on the beach is hotter than on the mountain due to the proximity to water, lower elevation, and increased exposure to sunlight. These factors combine to create a warmer and more pleasant climate on the beach compared to the cooler temperatures experienced on mountains.