September weather forecast
Grand Canyon National Park, AZ

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The famed Horseshoe bend at the iconic Grand Canyon National Park, Arizona
The famed Horseshoe bend at the iconic Grand Canyon National Park, Arizona

Weather in September

September brings the transition from hot summers to milder autumns. Throughout the month, visitors witness temperatures easing off from the hot summer peaks to a more pleasant 93°F (33.9°C). Rainfall levels decline while daylight hours shorten, suggesting the end of summer. However, the park receives significant sunlight, making the landscape glow in autumnal hues. Visiting the park during this month ensures more comfortable weather conditions.

Temperature

The shift from August to September in Grand Canyon National Park includes a small decrease in the average high-temperature, from a sweltering 100°F (37.8°C) to a hot 93°F (33.9°C). A noticeable temperature swing characterizes Grand Canyon National Park's September nights, dipping to an average of 66°F (18.9°C).

Rainfall

In September, in Grand Canyon National Park, the rain falls for 3 days. Throughout September, 1.02" (26mm) of precipitation is accumulated. In Grand Canyon National Park, during the entire year, the rain falls for 33 days and collects up to 9.69" (246mm) of precipitation.

Snowfall

In Grand Canyon National Park, snow does not fall in February through November.

Daylight

The average length of the day in September in Grand Canyon National Park is 12h and 23min.
On the first day of the month, sunrise is at 6:00 am and sunset at 6:55 pm. On the last day of September, in Grand Canyon National Park, sunrise is at 6:23 am and sunset at 6:12 pm MST.

Sunshine

In Grand Canyon National Park, the average sunshine in September is 10h.

UV index

In September, the average daily maximum UV index in Grand Canyon National Park is 8. A UV Index of 8 to 10 symbolizes a very high health hazard from unsafe exposure to UV radiation for the average person.
Note: In September, the maximum UV index of 8 transforms into these recommendations:
Always stay safe. Unprotected skin and eyes can get damaged rapidly. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.

Frequently asked questions

How hot does it get in Grand Canyon National Park in September?

Grand Canyon National Park in September has an average high-temperature of 93°F (33.9°C) and an average low-temperature of 66°F (18.9°C).

How many days does it rain in September in Grand Canyon National Park?

In Grand Canyon National Park, in September, it is raining for 3 days, with typically 1.02" (26mm) of accumulated precipitation.

When it does not snow in Grand Canyon National Park?

February through November are months without snowfall.

How many hours of daylight does Grand Canyon National Park have in September?

In Grand Canyon National Park, Arizona, the average day length in September is 12h and 23min.

What time are sunrise and sunset in September in Grand Canyon National Park?

In September, on the first day of the month, sunrise is at 6:00 am and sunset at 6:55 pm. On the last day of the month, in Grand Canyon National Park, sunrise is at 6:23 am and sunset at 6:12 pm MST.

How many hours of sunshine does Grand Canyon National Park have in September?

In Grand Canyon National Park, Arizona, the average sunshine duration in September is 10h.

What is the UV index intensity in September in Grand Canyon National Park?

In September, the average daily maximum UV index in Grand Canyon National Park, Arizona, is 8. A UV Index of 8 to 10 symbolizes a very high hazard to health from exposure to the Sun's UV radiation.
Average rainfall days
Average snowfall
Average daylight
Average sunshine
Average UV index

Average temperature in September
Grand Canyon National Park, AZ

Average temperature in September - Grand Canyon National Park, AZ
  • Average high temperature in September: 93°F

The warmest month (with the highest average high temperature) is July (104°F).
The months with the lowest average high temperature are January and December (55°F).

  • Average low temperature in September: 66°F

The month with the highest average low temperature is July (74°F).
The coldest month (with the lowest average low temperature) is January (35°F).

Average rainfall in September
Grand Canyon National Park, AZ

Average rainfall in September - Grand Canyon National Park, AZ
  • Average rainfall in September: 1"

The wettest month (with the highest rainfall) is August (1.5").
The driest month (with the least rainfall) is June (0.2").

Average rainfall days in September
Grand Canyon National Park, AZ

Average rainfall days in September - Grand Canyon National Park, AZ
  • Average rainfall days in September: 3 days

The month with the highest number of rainy days is August (5 days).
The months with the least rainy days are May and June (1 days).

Average snowfall in September
Grand Canyon National Park, AZ

Average snowfall in September - Grand Canyon National Park, AZ
  • Average snowfall in September: 0"

The months with the highest snowfall are January and December (0.1").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").

Average daylight in September /
Average sunshine in September
Grand Canyon National Park, AZ

Average daylight in September / Average sunshine in September - Grand Canyon National Park, AZ
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 10h

The month with the most sunshine is June (Average sunshine: 13h).
The months with the least sunshine are January and December (Average sunshine: 7h).

Average UV index in September
Grand Canyon National Park, AZ

Average UV index in September - Grand Canyon National Park, AZ
  • Average UV index in September: 8

The months with the highest UV index are June and July (UV index 11).
The month with the lowest UV index is December (UV index 2).

Grand Canyon National Park, Arizona, USA

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