Planning for the weather is a good way to make your trip to Asunción relaxing and enjoyable, especially when you’re splurging. The hottest months are usually January and December, with an average temperature of 28°C, while the coldest months are July and June, with an average of 19°C. The rainiest months in Asunción are October, November, April and December, with each month seeing an average of 183 mm of rainfall.