Question: Where in the Grand Canyon does it commonly rain in the summer months?
About the article "Grand Canyon", section "Geography".

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 Grand Canyon of the East, New York, USA Grand Canyon of the Fraser, Canada (not to be confused with the Fraser Canyon proper) Grand Canyon of the Liard River, Canada Grand Canyon of the Nechako, in British Columbia Grand Canyon of the Pacific in Hawaii Grand Canyon of Pennsylvania, USA more commonly known as Pine Creek Gorge Grand Canyon of the Stikine, Canada Grand Canyon of the Tuolumne, USA Grand Canyon of the Yellowstone, USA Greenland's Grand Canyon under the ice of north Greenland  The Grand Canyon between Andissa and Vatoussa, on the Greek island of Lesvos Verdon Gorge, the "Grand Canyon du Verdon", France In geography.
Canyons which are sometimes referred to as Grand Canyons but are not officially named as such: Breaks Interstate Park, the "Grand Canyon of the South", Virginia, Kentucky, USA Copper Canyon, Mexico Great Canyon (Homathko River), also known as the Grand Canyon of the Homathko Nahanni River, Canada (see Nahanni National Park Reserve) Valles Marineris, on Mars, is also known as the "Grand Canyon"; it is the largest canyon in the Solar System  
Grand Canyon High School is a public high school located near the Grand Canyon in Grand Canyon Village, Arizona.
It is the only high school in the Grand Canyon Unified School District. 
The Grand Canyon is a big fissure in the Colorado Plateau that exposes uplifted Proterozoic and Paleozoic strata, and is also one of the 19 distinct physiographic sections of the Colorado Plateau province.
It is not the deepest canyon in the world (Kali Gandaki Gorge in Nepal is far deeper), however, the Grand Canyon is known for its visually overwhelming size and its intricate and colorful landscape.
Geologically it is significant because of the thick sequence of ancient rocks that is beautifully preserved and exposed in the walls of the canyon.
These rock layers record much of the early geologic history of the North American continent.
Uplift associated with mountain formation later moved these sediments thousands of feet upward and created the Colorado Plateau.
The higher elevation has also resulted in greater precipitation in the Colorado River drainage area, but not enough to change the Grand Canyon area from being semi-arid.
The uplift of the Colorado Plateau is uneven, and the Kaibab Plateau that Grand Canyon bisects is over a thousand feet higher at the North Rim (about ) than at the South Rim.
Almost all runoff from the North Rim (which also gets more rain and snow) flows toward the Grand Canyon, while much of the runoff on the plateau behind the South Rim flows away from the canyon (following the general tilt).
The result is deeper and longer tributary washes and canyons on the north side and shorter and steeper side canyons on the south side.
Temperatures on the North Rim are generally lower than those on the South Rim because of the greater elevation (averaging 8,000 ft/2,438 m above sea level).
Heavy rains are common on both rims during the summer months.
Access to the North Rim via the primary route leading to the canyon (State Route 67) is limited during the winter season due to road closures.
Grand Canyon may refer to:  The Grand Canyon of the Colorado River, United States (the best-known "Grand Canyon") *Grand Canyon National Park, surrounding the canyon in Arizona *Grand Canyon Village, Arizona, a community within the national park Grand Canyon may also refer to: 
The Grand Canyon Depot was declared a National Historic Landmark on May 28, 1987.
It is also included in the Grand Canyon Village National Historic Landmark District.