When you're travelling with pets, keeping tabs on the weather can help you make the trip more safe and fun for everyone. The hottest months are usually May and April, with an average temperature of 22°C, while the coldest months are January and February, with an average of 17°C. The rainiest months in Atotonilco el Alto are July, August, September and June, with each month seeing an average of 206 mm of rainfall.