average temperature by month in phoenix az
Average Temperatures for Phoenix. Phoenix's coldest month is January when the average temperature overnight is 43.4Â°F. In July, the warmest month, the average day time temperature rises to 104.2Â°F. Average Rainfall for Phoenix. The driest month in Phoenix is June with 0.09 inches of precipitation, and with 1.07 inches March is the wettest month.