Tucson (AZ) Temperature by Month

The average annual maximum temperature in Tucson, Arizona, United States of America is 29°C (84°F), with daytime highs ranging from 18°C (64°F) in December to 39°C (102°F) in June. This page covers monthly averages, day-night differences, and how Tucson compares to cities worldwide.

Depending on the time of the year, temperatures range from very hot to pleasant in Tucson. Nighttime lows follow the same pattern, ranging from 22°C (72°F) to 4°C (39°F).

The chart below illustrates the average maximum day and minimum night temperatures in Tucson by month:

Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. June, the warmest month of the year, receives 397 hours of sunshine.

The chart below shows the average temperature throughout the year:

Tucson's average annual maximum temperature is 29°C (84°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Tucson, December is the coolest month, with average highs of 18°C (64°F) and humidity around 50%, considered moderate. In June, the warmest month, temperatures average 39°C (102°F) with 21% humidity, conditions that feel low. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Tucson this rarely lasts long on the ground.

For more on Tucson's weather, including monthly rainfall, sunshine hours, and humidity, visit our Tucson climate page.