May weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona, at dusk
The city of Phoenix, Arizona, at dusk
May in Phoenix is the official onset of summer. It is characterized by a rise in temperature to read an average between 60.8°F (16°C) and 93.2°F (34°C). It is also marked by an increase in the sunshine hours to approximately thirteen but a sharp decline in the rainfall that may fall for only two days in the whole month to collect at 0.2" (5.1mm). With humidity is steady at 16%, a dip in the pool is the best way to keep the heat at bay at this time.
Most people can brave the heat, but at this time of year, there are fewer tourists, and even locals leave for colder places.

What is the temperature in May in Phoenix?

In May, the average high-temperature is 94.8°F (34.9°C), and the average low-temperature is 69.4°F (20.8°C).

What is the average humidity in May in Phoenix?

The average relative humidity in May is 21.9%.

How much does it rain in Phoenix in May?

In May, in Phoenix, the rain falls for 1 days. Throughout May, 0.1" (2.8mm) of precipitation is accumulated.

How many hours of daylight does Phoenix have in May?

In May, the average length of the day in Phoenix is 13.9h.

How long on average sun shines in May in Phoenix?

In May, the average sunshine in Phoenix is 12.9h.

What is the UV index intensity in May in Phoenix?

The average UV index in May in Phoenix, Arizona, is 10.
Average temperature in May - Phoenix, AZ
  • Average high temperature in May: 94.8°F

The warmest month (with the highest average high temperature) is July (106.1°F).
The month with the lowest average high temperature is December (66°F).

  • Average low temperature in May: 69.4°F

The month with the highest average low temperature is July (83.5°F).
The coldest month (with the lowest average low temperature) is December (44.8°F).

Average humidity in May - Phoenix, AZ
  • Average humidity in May: 21.9%

The month with the highest relative humidity is December (51.8%).
The month with the lowest relative humidity is June (19.4%).

Average rainfall in May - Phoenix, AZ
  • Average rainfall in May: 0.1"

The wettest month (with the highest rainfall) is July (1.1").
The driest month (with the lowest rainfall) is June (0").

Average rainfall days in May - Phoenix, AZ
  • Average rainfall days in May: 1 days

The month with the highest number of rainy days is August (5 days).
The month with the lowest number of rainy days is June (0.5 days).

Average daylight in May / Average sunshine in May - Phoenix, AZ
  • Average daylight in May: 13.9h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in May: 12.9h

The month with most sunshine is June (Average sunshine: 13.6h).
The month with least sunshine is December (Average sunshine: 7.9h).

Average UV index in May - Phoenix, AZ
  • Average UV index in May: 10

The month with the highest UV index is July (UV index 11).
Months with the lowest UV index are January and December (UV index 3).

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