Casa Grande Weather in September

What's the weather like in Casa Grande (Arizona) in September 2025?

The climate in Casa Grande during September can be summarized as very hot and dry.

September is in the fall / autumn in Casa Grande and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a warm 37°C (99°F), whilst at night 20°C (67°F) is normal.

Casa Grande weather averages (imperial / metric)
Daytime temperature 37°C 98.5°F
Nightly temperature 19.7°C 67.4°F
Average temperature 28.3°C 82.9°F
Daily sunshine 11.6 hrs
Avg rainfall 20 mm 0.8 ins
Rainy days 4 days
Sea temperature 24.4°C 75.8°F
Humidity 39%
Windspeed 12.6kph 8 mph

On average September is the 6th wettest month of the year in Casa Grande with around 20mm 0.8 inches of rain making it a dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 11.6 hours of sunshine per day.

September temperatures in Casa Grande

Casa Grande average temperature in September

September rainfall

Casa Grande average rain in September

September hourly sunshine

Casa Grande average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Casa Grande in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Casa Grande weather stats

Casa Grande weather statistics
Hottest month: July 40.6°C 105.1°F
Driest month: June 3mm 0.1ins
Sunniest month: June 14.3hrs
Coldest month: January 18.6°C 65.5°F
Wettest month: August 46mm 1.8ins
Map showing location of Casa Grande (32.8795, -111.75735) Casa Grande map pin © Google

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