May weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona, at dusk
The city of Phoenix, Arizona, at dusk
May, the last month of the spring, in Phoenix, is a hot month, with temperature in the range of an average low of 67.6°F (19.8°C) and an average high of 90.9°F (32.7°C).

Temperature

In Phoenix, the average high-temperature marginally rises, from a moderately hot 83.1°F (28.4°C) in April, to a tropical 90.9°F (32.7°C). The average low-temperature, in Phoenix, is 67.6°F (19.8°C).

Humidity

In May, the average relative humidity is 19%.

Rainfall

Months with the least rainfall are May and June Rain falls for 1.3 days and accumulates 0.08" (2mm) of rain.

Snowfall

In Phoenix snow does not fall in January through August, October through December.

Daylight

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

Sunshine

In May, the average sunshine in Phoenix, Arizona, is 11.9h.

UV index

Months with the highest UV index are May through August, with an average maximum UV index of 8. A UV Index estimate of 8 to 10 represents a very high health vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 8 transform into the following instructions:
Take special precautions, as unprotected skin can be damaged and can burn quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in May in Phoenix?

The average high-temperature, in May, in Phoenix, Arizona, is 90.9°F (32.7°C), while the average low-temperature is 67.6°F (19.8°C).

What is the average humidity in May in Phoenix?

In May, the average relative humidity in Phoenix is 19%.

How many days does it rain in May in Phoenix?

In May, in Phoenix, the rain falls for 1.3 days. Throughout May, 0.08" (2mm) of precipitation is accumulated.

What is the driest month in Phoenix?

May and June are months with the least rain in Phoenix, Arizona, when the rain falls for 1.3 days and typically aggregates up to 0.08" (2mm) of rain.

When it does not snow in Phoenix?

In Phoenix, Arizona, snow does not fall in January through August, October through December.

What is the average length of the day in May in Phoenix?

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

How long on average sun shines in May in Phoenix?

The average sunshine in May is 11.9h.

What is the month with the highest UV index in Phoenix?

Months with the highest UV index in Phoenix are May through August, with an average maximum UV index of 8.

How high is the UV index in May in Phoenix?

In Phoenix, Arizona, the average daily maximum UV index in May is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in May - Phoenix, AZ
  • Average high temperature in May: 32.7°C

The warmest month (with the highest average high temperature) is July (39.8°C).
The month with the lowest average high temperature is December (17.2°C).

  • Average low temperature in May: 19.8°C

The month with the highest average low temperature is August (29.3°C).
The coldest month (with the lowest average low temperature) is January (8.6°C).

Average pressure in May - Phoenix, AZ
  • Average pressure in May: 1010.5mbar

The month with the highest atmospheric pressure is January (1018.9mbar).
The month with the lowest atmospheric pressure is June (1009.5mbar).

Average wind speed in May - Phoenix, AZ
  • Average wind speed in May: 10.2km/h

The windiest month (with the highest average wind speed) is April (10.3km/h).
The calmest month (with the lowest average wind speed) is December (7km/h).

Average humidity in May - Phoenix, AZ
  • Average humidity in May: 19%

The month with the highest relative humidity is December (43%).
The month with the lowest relative humidity is June (16%).

Average rainfall in May - Phoenix, AZ
  • Average rainfall in May: 2mm

The wettest month (with the highest rainfall) is July (19mm).
The driest months (with the least rainfall) are May and June (2mm).

Average rainfall days in May - Phoenix, AZ
  • Average rainfall days in May: 1.3 days

The month with the highest number of rainy days is July (7.8 days).
The month with the least rainy days is June (0.8 days).

Average snowfall in May - Phoenix, AZ
  • Average snowfall in May: 0mm

The month with the highest snowfall is September (1mm).
Months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0mm).

Average snowfall days in May - Phoenix, AZ
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is September (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 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 the shortest days is December (Average daylight: 10h).

  • Average sunshine in May: 11.9h

The month with the most sunshine is June (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.8h).

Average sunshine days in May - Phoenix, AZ
  • Average sunshine days in May: 29.2 days

The month with the most sunshine days is May (29.2 days).
The month with the least sunshine days is July (21.1 days).

Average UV index in May - Phoenix, AZ
  • Average UV index in May: 8

Months with the highest UV index are May, June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in May - Phoenix, AZ
  • Average cloud cover in May: 8

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 5).

Average visibility in May - Phoenix, AZ
  • Average visibility in May: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).