Tucson, with more than 340 days of sunshine a year, is primarily a dry climate, thanks to our location in the middle of the desert. Our monsoon rainy season stretches from mid-July through mid-September, producing epic thunderstorms and microbursts. Most of the year we’ve got plenty of sunshine and opportunities to explore the desert or hang out by the pool. Average Tucson high and low temperatures by month, plus rainfall and more.   Average Weather In Tucson