Phoenix
Arizona, USA
Long-term weather forecast
Long-term weather forecast

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 average temperature fluctuating between 90.9°F (32.7°C) and 67.6°F (19.8°C).

Temperature

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

Humidity

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

Rainfall

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

Snowfall

January through August, October through December are months without snowfall.

Daylight

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

Sunshine

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

UV index

Months with the highest UV index in Phoenix are May through August, with an average maximum UV index of 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 8 in May interpret into the following advice:
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, 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?

The average relative humidity in May in Phoenix is 19%.

How much does it rain in Phoenix in May?

In Phoenix, in May, it is raining for 1.3 days, with typically 0.08" (2mm) of accumulated precipitation.

What is the driest month in Phoenix?

May and June are months with the least rain in Phoenix 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, Arizona, the average length of the day in May is 13.9h.

How many hours of sunshine does Phoenix have in May?

The average sunshine in May in Phoenix 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.

What is the UV index intensity in May in Phoenix?

In May, the average daily maximum UV index in Phoenix 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: 90.9°F

The warmest month (with the highest average high temperature) is July (103.6°F).
The month with the lowest average high temperature is December (63°F).

  • Average low temperature in May: 67.6°F

The month with the highest average low temperature is August (84.7°F).
The coldest month (with the lowest average low temperature) is January (47.5°F).

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: 0.08"

The wettest month (with the highest rainfall) is July (0.75").
Driest months (with the lowest rainfall) are May and June (0.08").

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 lowest number of rainy days is June (0.8 days).

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

The month with the highest snowfall is September (0.04").
Months with the lowest snowfall are January, February, March, April, May, June, July, August, October, November and December (0").

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 lowest number of 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 shortest days is December (Average daylight: 10h).

  • Average sunshine in May: 11.9h

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

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).