If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Ciudad Hidalgo: The hottest months are usually April and May with an average temp of 66°F, while the coldest months are January and December with an average of 58°F. The rainiest months in Ciudad Hidalgo are July, August, September, and June, with each month seeing an average of 18 inches of rainfall.