Desert nights in Baja California and northern Mexico can become surprisingly cold, even after a very hot day. Dry air and clear skies allow temperatures to fall quickly after sunset, with the biggest changes often occurring in inland areas away from the moderating influence of the coast. Pack warm layers, particularly if you plan to camp or spend several hours outdoors after dark. First-time visitors often underestimate the nighttime chill, so preparing for both daytime heat and cooler evenings is essential for a comfortable Baja desert trip.