Visiting local bars in Umuarama is more fun in good weather. These rainfall averages and temperatures can help you determine the best time for bar hopping. The hottest months are usually December and January with an average temp of 77°F, while the coldest months are July and June with an average of 65°F. The rainiest months in Umuarama are October, December, January, and February, with each month seeing an average of 8 inches of rainfall.