May 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 May

The month of May brings the onset of summer weather in Grand Canyon National Park. The park basks in a soothing warmth with temperatures reaching 90°F (32.2°C). Sunny days and longer daylight hours enhance the beauty of the canyon's natural attractions. However, with high temperatures and a high UV index, precautions are advised for hikers and outdoor enthusiasts. Despite the soaring heat, time your visit wisely as rainfall is a rarity in May.

Temperature

May's onset in Grand Canyon National Park is marked by a temperature increase, moving from a warm 80.1°F (26.7°C) in April to a hot 90°F (32.2°C). Grand Canyon National Park witnesses a consistent, sharp contrast from the daytime highs, with an average low-temperature of 60.1°F (15.6°C) throughout May.

Rainfall

In Grand Canyon National Park, in May, it is raining for 1 days, with typically 0.31" (8mm) of accumulated precipitation. Throughout the year, there are 33 rainfall days, and 9.69" (246mm) of precipitation is accumulated.

Snowfall

February through November are months without snowfall in Grand Canyon National Park.

Daylight

In May, the average length of the day in Grand Canyon National Park, Arizona, is 14h and 6min.
On the first day of the month, sunrise is at 5:34 am and sunset at 7:16 pm. On the last day of May, sunrise is at 5:12 am and sunset at 7:39 pm MST.

Sunshine

In Grand Canyon National Park, the average sunshine in May is 12h.

UV index

In Grand Canyon National Park, the average daily maximum UV index in May is 10. A UV Index of 8 to 10 symbolizes a very high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index, 10 during May, leads to the following recommendations:
Always be cautious. Skin and eyes can be affected swiftly without protection. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Stay sun-safe with clothing that is both closely woven and worn loosely. Sunscreen of at least SPF 30 should be applied generously and reapplied often on overcast days, especially post swim or outdoor exercise.

Frequently asked questions

How hot is it in Grand Canyon National Park in May?

The average high-temperature and low-temperature in Grand Canyon National Park during May are 90°F (32.2°C) and 60.1°F (15.6°C) respectively.

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

In May, in Grand Canyon National Park, the rain falls for 1 days. Throughout May, 0.31" (8mm) of precipitation is accumulated.

When it does not snow in Grand Canyon National Park?

February through November are months without snowfall in Grand Canyon National Park.

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

In May, the average day length in Grand Canyon National Park is 14h and 6min.

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

On the first day of May in Grand Canyon National Park, Arizona, sunrise is at 5:34 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 5:12 am and sunset at 7:39 pm MST.

How long on average sun shines in May in Grand Canyon National Park?

In Grand Canyon National Park, Arizona, the average sunshine duration in May is 12h.

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

The average daily maximum UV index in May is 10. A UV Index of 8 to 10 symbolizes a very high health risk from unsafe exposure to Sun's UV rays.
Average rainfall days
Average snowfall
Average daylight
Average sunshine
Average UV index

Average temperature in May
Grand Canyon National Park, AZ

Average temperature in May - Grand Canyon National Park, AZ
  • Average high temperature in May: 90°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 May: 60°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 May
Grand Canyon National Park, AZ

Average rainfall in May - Grand Canyon National Park, AZ
  • Average rainfall in May: 0.3"

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 May
Grand Canyon National Park, AZ

Average rainfall days in May - Grand Canyon National Park, AZ
  • Average rainfall days in May: 1 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 May
Grand Canyon National Park, AZ

Average snowfall in May - Grand Canyon National Park, AZ
  • Average snowfall in May: 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 May /
Average sunshine in May
Grand Canyon National Park, AZ

Average daylight in May / Average sunshine in May - Grand Canyon National Park, AZ
  • Average daylight in May: 14h and 1min

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 May: 12h

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 May
Grand Canyon National Park, AZ

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

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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