Although weather is just one factor, it can really affect your travel plans, especially if you're planning an extended stay in Pirayú. The hottest months are usually January and February, with an average temperature of 28°C, while the coldest months are July and June, with an average of 18°C. The rainiest months in Pirayú are October, November, December and April, with each month seeing an average of 191 mm of rainfall.