Grand Canyon Weather in September

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

The climate in Grand Canyon during September can be summarized as warm and dry.

September is in the fall / autumn in Grand Canyon and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 28°C (82°F), whilst at night 10°C (50°F) is normal.

Grand Canyon weather averages (imperial / metric)
Daytime temperature	27.9°C 82.2°F
Nightly temperature	10.1°C 50.2°F
Average temperature	19°C 66.2°F
Daily sunshine	10.9 hrs
Avg rainfall	24 mm 1 ins
Rainy days	5 days
Sea temperature	18.3°C 64.9°F
Humidity	44%
Windspeed	14.8kph 9 mph

On average September is the 6th driest month of the year in Grand Canyon with around 24mm 1 inches of rain making it a dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.

On the flip side this corresponds to an average of 10.9 hours of sunshine per day.

September temperatures in Grand Canyon

Grand Canyon average temperature in September

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 Grand Canyon in September 2025.