Casa Grande, Arizona Weather
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Climate of Casa Grande: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), June is usually the hottest month in Casa Grande, with average daytime highs around 41°C. January is the coolest, when nights typically fall to about 4°C. That is a wide yearly range of roughly 37°C, so the seasons feel very different from each other.
The area receives about 220 mm of rain in a typical year. Rainfall is modest in every month; July is the wettest at about 33 mm. The driest stretch is March to June and October to November, with under 20 mm a month.
For outdoor plans and travel, February to April and October to November usually offer the most comfortable weather in Casa Grande, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 19° | 4° | 26 mm | 47% |
| Feb | 21° | 6° | 25 mm | 44% |
| Mar | 25° | 9° | 16 mm | 37% |
| Apr | 30° | 12° | 7 mm | 28% |
| May | 35° | 17° | 5 mm | 21% |
| Jun | 41° | 23° | 3 mm | 16% |
| Jul | 41° | 27° | 33 mm | 31% |
| Aug | 40° | 26° | 33 mm | 36% |
| Sep | 38° | 23° | 21 mm | 33% |
| Oct | 31° | 16° | 12 mm | 31% |
| Nov | 24° | 10° | 15 mm | 35% |
| Dec | 18° | 4° | 25 mm | 46% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Casa Grande. Values describe typical conditions, not a forecast.
About Casa Grande weather
Casa Grande lies in Arizona's mostly desert climate, with cooler high country in the north — about 70 km south-east of Phoenix. Expect extremely hot summers (May–September) with highs regularly above 40°C in the low deserts. Winter brings mild, dry winters in the desert, cold with snow in the northern highlands. This page shows live, auto-refreshing weather for Casa Grande: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Phoenix.
Frequently asked questions
Casa Grande is about 70 km south-east of Phoenix, in Arizona.
Casa Grande sees mild, dry winters in the desert, cold with snow in the northern highlands.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Casa Grande's exact coordinates. No fixed schedule, the page updates whenever you load it.
June is usually the hottest month in Casa Grande, with average daytime highs of about 41°C and nights around 23°C. Afternoons above 40°C are common then, so heatwave precautions matter.
The coldest nights come in January, when the average low is about 4°C and daytime highs reach around 19°C.
Casa Grande receives about 220 mm of rain in a typical year. July is the wettest month at roughly 33 mm; no month averages more than 100 mm.
February to April and October to November usually offer the most comfortable weather in Casa Grande, with mild daytime temperatures and little rain.
In November Casa Grande typically sees daytime highs near 24°C and lows near 10°C, with about 15 mm of rain over the month and average humidity around 35%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Casa Grande updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Casa Grande's day-to-day weather follows the broader pattern of Arizona described above. See the hourly weather forecast or the air quality index for more detail.