Visiting local bars in Monterrey is better when you know what the weather holds. These temperatures and rainfall averages can help you choose the best time for bar-hopping. The hottest months are usually February and January, with an average temperature of 25°C, while the coldest months are July and June, with an average of 23°C. The rainiest months in Monterrey are June, May, July and April, with each month seeing an average of 268 mm of rainfall.