May weather forecast
Phoenix, AZ

The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk

Weather in May

May, the last month of the spring in Phoenix, is a hot month, with an average temperature varying between 67.6°F (19.8°C) and 90.9°F (32.7°C).

Temperature

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

Humidity

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

Rainfall

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.

Snowfall

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

Daylight

In May, the average length of the day is 13h and 55min.
On the first day of May, sunrise is at 5:39 am and sunset at 7:11 pm. On the last day of the month, sunrise is at 5:19 am and sunset at 7:32 pm MST.

Sunshine

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

UV index

The months with the highest UV index in Phoenix are May through August, with an average maximum UV index of 8. A UV Index of 8 to 10 symbolizes a very high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in May in Phoenix?

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

What is the driest month in Phoenix?

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

How much does it rain in Phoenix in May?

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

When it does not snow in Phoenix?

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

How many hours of daylight does Phoenix have in May?

The average day length in May in Phoenix is 13h and 55min.

What time are sunrise and sunset in May in Phoenix?

On the first day of May in Phoenix, sunrise is at 5:39 am and sunset at 7:11 pm. On the last day of the month, sunrise is at 5:19 am and sunset at 7:32 pm MST.

How many hours of sunshine does Phoenix have in May?

The average sunshine duration in May in Phoenix, Arizona, is 11.9h.

When is the highest UV index in Phoenix?

The 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 reading in May in Phoenix?

In Phoenix, the average daily maximum UV index in May is 8. A UV Index value of 8 to 10 symbolizes a very high health risk from unprotected exposure to UV radiation.

Average temperature in May
Phoenix, AZ

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).

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Average pressure in May
Phoenix, AZ

Average pressure in May - Phoenix, AZ
  • Average pressure in May: 29.84"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.81"Hg).

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Average wind speed in May
Phoenix, AZ

Average wind speed in May - Phoenix, AZ
  • Average wind speed in May: 6.3mph

The windiest month (with the highest average wind speed) is April (6.4mph).
The calmest month (with the lowest average wind speed) is December (4.3mph).

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Average humidity in May
Phoenix, AZ

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%).

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Average rainfall in May
Phoenix, AZ

Average rainfall in May - Phoenix, AZ
  • Average rainfall in May: 0.08"

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

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Average rainfall days in May
Phoenix, AZ

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).

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Average snowfall in May
Phoenix, AZ

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

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

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Average snowfall days in May
Phoenix, AZ

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).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).

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Average daylight in May /
Average sunshine in May
Phoenix, AZ

Average daylight in May / Average sunshine in May - Phoenix, AZ
  • Average daylight in May: 13h and 55min

The month with the longest days is June (Average daylight: 14h and 20min).
The month with the shortest days is December (Average daylight: 9h and 59min).

  • 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).

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Average sunshine days in May
Phoenix, AZ

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).

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Average UV index in May
Phoenix, AZ

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

The 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).

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Average cloud cover in May
Phoenix, AZ

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).

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Average visibility in May
Phoenix, AZ

Average visibility in May - Phoenix, AZ
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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