The Sonoran Desert's monsoon season delivers short but intense rainfall, which is crucial for replenishing water sources and supporting desert life.

The North American monsoon, occurring from June to September, brings sudden thunderstorms, flash floods, and increased humidity to the Sonoran Desert. This seasonal rainfall revives desert vegetation, replenishes groundwater, and supports wildlife. Many desert plants, like the Saguaro cactus, rely on this rain to store water for drier months. Animals, such as amphibians, emerge to breed in temporary pools. While the monsoon season is essential for maintaining the ecosystem, its rainfall is sporadic and does not provide consistent year-round moisture.