Casa Grande (AZ) Temperature by Month

Casa Grande in Arizona, United States of America sees significant seasonal temperature differences, with daytime highs between 18°C (64°F) in December and 40°C (104°F) in June, averaging 30°C (86°F) annually. Explore the full monthly breakdown below.

Visitors to Casa Grande will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 21°C (70°F) in June to 3°C (37°F) in December.

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

The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. June, the warmest month, gets 407 hours of sunshine.

The chart below shows the average temperature throughout the year:

Casa Grande's average annual maximum temperature is 30°C (86°F). To put that in context, here's how it compares to a few well-known destinations:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

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 Casa Grande, December is the coolest month, with average highs of 18°C (64°F) and humidity around 51%, considered moderate. In June, the warmest month, temperatures average 40°C (104°F) with 19% 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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

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