Thermoregulatory dysfunction—temperature intolerance and/or inappropriate compensation—is an underrecognized feature of Parkinson’s disease (PD) and is linked to poor quality of life. Multiple mechanisms may underlie this dysfunction, including α-synuclein deposition in relevant structures, altered functional connectivity in thermoregulatory networks, and disrupted neurotransmitter modulation, on top of the deleterious consequences of aging. Although multiple advanced tests can confirm this dysfunction, diagnosis is largely based on a detailed history. Once this critical symptom is identified, management focuses on crisis prevention and safety, as PD-specific clinical trials are often lacking. This narrative review of the literature addresses mechanisms, clinical expression, diagnostic evaluation, and management of thermoregulatory dysfunction in PD to help guide care for this underappreciated, yet potentially debilitating, non-motor symptom of PD. Future PD-specific trials are needed to further clarify underlying mechanisms and improve treatment options.