A majority of climate models suggest that precipitation in the Southeast will increase in the winter, spring, and fall by the end of the century, but summer is generally expected to become drier.

Simulated changes in summer precipitation by the end of the century range from a 0-10% decrease, with the largest decreases occurring in southern Florida and Arkansas and Tennessee. The means of several climate models indicate that winter and spring precipitation may increase around 15% by the end of the century, particularly in the northern part of the region. Daily precipitation totals in the Southeast have increased substantially in the fall season; this trend is expected to continue, with the greatest expected increases along the Gulf Coast. Overall, only minimal change or slight increases in precipitation are projected along much of the Atlantic and Gulf Coasts. These projections are averaged outputs from a climate scenario with higher emissions (A2), and under mild climate scenarios changes are generally expected to be smaller.