Weather will likely play an important role when you plan your trip to Erechim, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually January and December, with an average temperature of 21°C, while the coldest months are July and June, with an average of 14°C. The rainiest months in Erechim are October, May, September and December, with each month seeing an average of 239 mm of rainfall.