TAMMs is the first integrated framework that simultaneously performs temporal change description (TCD) and future satellite image forecasting (FSIF) in time-series satellite image analysis. To address the challenges of long-term temporal dynamics modeling, TAMMs introduces a temporal adaptation module (TAM), which enhances the long-term dynamics understanding capability of fixed MLLMs, and a semantic fusion control injection (SFCI) mechanism that translates change understanding into fine-grained generative control. Through this synergistic design, understanding the TCD task directly enhances the consistency of the FSIF task.