San Mateo Ixtatan's climate is characterized by mild winters and warm summers, with temperatures rarely dropping below 3°C or rising above 31°C. Spring arrives in March, bringing slightly warmer days, but the overall average temperature remains steady at around 18-19°C until May. Summer months from June to August are warm, with highs peaking in July and August, but still averaging a comfortable 19°C. Autumn is similar to spring, with temperatures gradually cooling down as winter sets in by November. The coolest period of the year runs from December to February, when average temperatures dip to around 16°C.