June in Rio Grande is the cloudiest month of the year. In June, the weather in Rio Grande is typically hot. Average daily high temperature in June is about 30 degrees above zero. On average, Rio Grande has 17 rainy, 7 partly cloudy, 3 sunny, and 3 cloudy days in June. The rains are usually moderate. June as well as May, July, August, and September is considered the most uncomfortable time to visit Rio Grande.