When you travel with your pet, keeping tabs on the weather can help you make the trip more safe and fun for everyone. The hottest months are usually April and May, with an average temperature of 27°C, while the coldest months are December and January, with an average of 25°C. The rainiest months in Santa María Colotepec are September, June, October and August, with each month seeing an average of 518 mm of rainfall.