Last updated: June 24, 2025
In Casa Grande, United States, the average temperature in September reaches a warm 31°C (88°F). Temperatures can range significantly, with a cool minimum of 12°C (55°F) to a scorching maximum of 45°C (113°F). Visitors can expect 21 mm (0.8 in) of precipitation over 2 days, while the humidity averages around 64%.
In September in Casa Grande, the average temperature is 31°C (88°F), with maximums reaching up to 45°C (113°F) and minimums dropping as low as 12°C (55°F). Be prepared for a mix of scorching heat and cooler evenings while traveling during this time.
In Casa Grande in September, the precipitation amount is 21 mm (0.8 in) over a period of 2 days.
In Casa Grande in September humidity is 64%. With an average temperature of 31°C (88°F), this humidity feels like a warm, enveloping blanket, making outdoor activities more challenging and creating a thirst for refreshing drinks as you navigate the sights.
In Casa Grande in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Casa Grande.
UV Risk Categories
Weather in Casa Grande varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Casa Grande, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 12°C (55°F) | 20 mm (0.8 inches) | 76% | moderate |
| February Weather | 14°C (58°F) | 29 mm (1.1 inches) | 79% | high |
| March Weather | 18°C (65°F) | 19 mm (0.7 inches) | 67% | very high |
| April Weather | 24°C (75°F) | 1 mm (0.1 inches) | 55% | extreme |
| May Weather | 27°C (81°F) | 1 mm (0.1 inches) | 40% | extreme |
| June Weather | 33°C (92°F) | 5 mm (0.2 inches) | 33% | extreme |
| July Weather | 34°C (94°F) | 38 mm (1.5 inches) | 34% | extreme |
| August Weather | 34°C (94°F) | 36 mm (1.4 inches) | 48% | extreme |
| September Weather | 31°C (88°F) | 21 mm (0.8 inches) | 64% | very high |
| October Weather | 24°C (76°F) | 15 mm (0.6 inches) | 67% | very high |
| November Weather | 19°C (66°F) | 13 mm (0.5 inches) | 77% | moderate |
| December Weather | 13°C (55°F) | 24 mm (0.9 inches) | 82% | moderate |