Tucson Weather in September

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

The climate in Tucson during September can be summarized as hot and reasonably dry.

September is in the fall / autumn in Tucson and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a warm 34°C (94°F), whilst at night 21°C (69°F) is normal.

Tucson weather averages (imperial / metric)
Daytime temperature	34.2°C 93.6°F
Nightly temperature	20.8°C 69.4°F
Average temperature	27.5°C 81.5°F
Daily sunshine	11.3 hrs
Avg rainfall	34 mm 1.3 ins
Rainy days	6 days
Sea temperature	24.1°C 75.3°F
Humidity	43%
Windspeed	13.7kph 9 mph

On average September is the 3rd wettest month of the year in Tucson with around 34mm 1.3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.

On the flip side this corresponds to an average of 11.3 hours of sunshine per day.

September temperatures in Tucson

September rainfall

September hourly sunshine

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 Tucson in September 2025.