temperature tucson az
Average Temperatures for Tucson. Tucson's coldest month is January when the average temperature overnight is 38.9Â°F. In June, the warmest month, the average day time temperature rises to 100.2Â°F. Average Rainfall for Tucson. The driest month in Tucson is May with 0.24 inches of precipitation, and with 2.30 inches August is the wettest month.