The two climate zones that can be found in the Coastal Plains are tropical and humid subtropic.

Warm temperatures and high humidity, especially in the southern sections, define the tropical climate, which supports a variety of habitats and lush vegetation. With hot summers and mild winters, the humid subtropical climate—which is common in places like the Carolinas and portions of Texas—contributes to rich soils that are perfect for farming. These climate zones are essential to the region's natural and economic landscape because they sustain a range of crops, including citrus fruits and cotton, and they also have an impact on local weather patterns, such as heavy rainfall and the likelihood of storms.