Phoenix
Arizona, USA
Long-term weather forecast
Long-term weather forecast
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May weather forecast and Climate
Phoenix, AZ

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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 around this time of year there are fewer tourists, and even locals leave for colder places.
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  • The 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).

  • The 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).

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  • The 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%).

  • The 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").

  • The 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).

  • The average daylight in May: 14h

Months with the longest days are May, June and July (Average daylight: 14h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The 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).

  • The 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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