June in Rivera is the coldest month of the year. In June, the weather in Rivera is typically warm. Average daily high temperature in June is about 15 degrees above zero. On average, Rivera has 12 sunny, 11 partly cloudy, 5 rainy, and 2 cloudy days in June. The rains are usually heavy. June as well as February, May, July, and September is considered the most uncomfortable time to visit Rivera.