weather for  tucson, az. in september
Weather in Tucson in September. The average maximum daytime temperature in Tucson in September is a hot 34Â°C (93Â°F) with high heat & humidity. There are usually 11 hours of bright sunshine each day, which represents 85% of the 12 hours of daylight. Expect 34mm (1.3 inches) of rainfall across the whole of September with 5 days with some rain falling.