Moisture content and temperature are the two factors that cause the spoilage of food. When the moisture content is more and the temperature is between 5 to 60 degree celcius, food tend to spoil faster. In the rainy season, the amount of moisture in the air is more. This provides a suitable environment for the germs and fungus to grow, thereby spoiling the food.
Hence, food items tend to spoil faster during the rainy season.