When you travel with your pet, keeping tabs on the weather can help you make the trip more safe and fun for everyone. The hottest months are usually February and January, with an average temperature of 25°C, while the coldest months are July and August, with an average of 19°C. The rainiest months in Balneário Arpoador are January, February, March and December, with each month seeing an average of 224 mm of rainfall.