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

August weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona, at dusk
The city of Phoenix, Arizona, at dusk
The last month of the summer, August, is also a sweltering month in Phoenix, Arizona, with average temperature varying between 84.7°F (29.3°C) and 102.6°F (39.2°C).

Temperature

In Phoenix, the average high-temperature in August is practically the same as in July - a still very hot 102.6°F (39.2°C). In August, in Phoenix, the average low-temperature is 84.7°F (29.3°C).

Humidity

In Phoenix, Arizona, the average relative humidity is 30%.

Rainfall

In Phoenix, it is raining for 7.2 days, with typically 0.59" (15mm) of accumulated precipitation. In Phoenix, during the entire year, the rain falls for 44.6 days and collects up to 5.04" (128mm) of precipitation.

Snowfall

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

Daylight

The average length of the day is 13.3h.

Sunshine

In August, the average sunshine is 12h.

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 risk from the exposure to the Sun's UV radiation for average individuals.
Note: In August, the average maximum UV index of 8 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. 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 August in Phoenix?

In August, the average high-temperature is 102.6°F (39.2°C), and the average low-temperature is 84.7°F (29.3°C).

What is the average humidity in August in Phoenix?

In Phoenix, the average relative humidity in August is 30%.

How many days does it rain in August in Phoenix?

In Phoenix, Arizona, in August, it is raining for 7.2 days, with typically 0.59" (15mm) of accumulated precipitation.

Does it snow in Phoenix in August?

In Phoenix, in August, it doesn't snow. In September, it regularly snows.

When it does not snow in Phoenix?

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

How many hours of daylight does Phoenix have in August?

In August, the average length of the day in Phoenix is 13.3h.

How long on average sun shines in August in Phoenix?

In August, the average sunshine is 12h.

What are the months with the highest UV index in Phoenix?

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

How high is the UV index in August in Phoenix?

In Phoenix, Arizona, the average daily maximum UV index in August is 8. A UV Index estimate of 8 to 10 represents a very high hazard to health from the exposure to the Sun's UV rays.
Average temperature in August - Phoenix, AZ
  • Average high temperature in August: 39.2°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 August: 29.3°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 humidity in August - Phoenix, AZ
  • Average humidity in August: 30%

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

Average rainfall in August - Phoenix, AZ
  • Average rainfall in August: 15mm

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

Average rainfall days in August - Phoenix, AZ
  • Average rainfall days in August: 7.2 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 August - Phoenix, AZ
  • Average snowfall in August: 0mm

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

Average snowfall days in August - Phoenix, AZ
  • Average snowfall days in August: 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 August / Average sunshine in August - Phoenix, AZ
  • Average daylight in August: 13.3h

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 August: 12h

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 August - Phoenix, AZ
  • Average UV index in August: 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).