May weather forecast
Grand Canyon National Park, AZ

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.