Grand Canyon National Park
Arizona, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Grand Canyon National Park, AZ

A stunning aerial panorama on the famed Horseshoe bend at the iconic Grand Canyon National Park
A stunning aerial panorama on the famed Horseshoe bend at the iconic Grand Canyon National Park
August lies in summer and is the wettest month of the year with 1.5" (38.1mm) to 2.5" (63.5mm) of rain along the canyon and Rim areas. Temperatures are ranging from 70°F (21.1°C) to 100°F (37.8°C) around the canyon with frequent rainfall, sometimes torrential, which leads to storms and flash floods.
Grand Canyon has long days with 13 hours of sunlight that provide excellent opportunities to explore the park and its facilities. The Phantom Ranch area in the core of the park experiences 100°F (37.8°C) during midday in August and is one of the most crowded ones.

What is the temperature in August in Grand Canyon National Park?

In Grand Canyon National Park, in August, the average high-temperature is 100°F (37.8°C), and the average low-temperature is 72°F (22.2°C).

How much does it rain in Grand Canyon National Park in August?

In Grand Canyon National Park, in August, during 5 rainfall days, 1.5" (36.9mm) of precipitation is typically accumulated.

What is the wettest month in Grand Canyon National Park?

The month with the most rainfall is August when the rain falls for 5 days and typically aggregates up to 1.5" (36.9mm) of precipitation.

When it does not snow in Grand Canyon National Park?

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

What is the average length of the day in August in Grand Canyon National Park?

In Grand Canyon National Park, Arizona, the average length of the day in August is 13.5h.

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

In August, the average sunshine in Grand Canyon National Park, Arizona, is 11h.

What is the UV index reading in August in Grand Canyon National Park?

In Grand Canyon National Park, the average daily maximum UV index in August is 10. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in August - Grand Canyon National Park, AZ
  • Average high temperature in August: 100°F

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

  • Average low temperature in August: 72°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 August - Grand Canyon National Park, AZ
  • Average rainfall in August: 1.5"

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

Average rainfall days in August - Grand Canyon National Park, AZ
  • Average rainfall days in August: 5 days

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

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

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

Average daylight in August / Average sunshine in August - Grand Canyon National Park, AZ
  • Average daylight in August: 13.5h

The month with the longest days is June (Average daylight: 14.6h).
The month with shortest days is December (Average daylight: 9.7h).

  • Average sunshine in August: 11h

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

Average UV index in August - Grand Canyon National Park, AZ
  • Average UV index in August: 10

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).