Animals routinely experience temperature fluctuations that challenge the stability of neural circuits, yet many motor behaviors remain remarkably robust across wide thermal ranges. Climate change is increasing both the magnitude and variability of thermal stress experienced by ectothermic animals, making it essential to understand the neural mechanisms that set functional limits. Temperature is a powerful perturbation for neural circuits, directly altering ion channel kinetics, synaptic transmission, and neuronal excitability. My research uses rhythmic motor circuits in crustaceans to examine how neural networks maintain functional output across broad temperature ranges and where their limits lie. Our work combines intra- and extracellular electrophysiology, molecular biology, and fluorescence imaging in a comparative framework to dissect the mechanisms that allow neural circuits to cope with thermal challenges. A major emphasis of our work is on how neuropeptide modulation stabilizes circuit dynamics and extends functional temperature limits. Our results illustrate how robustness in neural circuits emerges from flexible interactions among cellular, synaptic, and modulatory mechanisms under increasing thermal variability in a changing climate.