Guastatoya's weather is characterized by mild winters and hot, humid summers. The coolest months are January, February, and November with temperatures ranging from 9-16°C, while the warmest months are April, May, June, July, August, September, and October with temperatures often soaring above 35°C. Spring (March to May) is a transitional period with temperatures gradually increasing, peaking in late spring and early summer. Summer months see temperatures consistently above 30°C, with occasional dips into the mid-teens at night. Autumn (September to November) sees temperatures return to more moderate levels, but still warm overall.