August weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk
A sharp rise in humidity to 36% marks the highest levels of the entire year. Temperatures drop a little to read between 75.2°F (24°C) and 104°F (40°C) but are still extremely high and scorching, and caution should always be exercised. August is marked by the highest rainfall recording all year falling for an average of five days during the month to collect 1.3" (33mm). Phoenix is known as the sunshine city - enjoy up to twelve hours of sunshine across the day.

What is the temperature in August in Phoenix?

In Phoenix, in August, the average high-temperature is 104.4°F (40.2°C), and the average low-temperature is 82.8°F (28.2°C).
Average temperature in August - Phoenix, AZ
  • Average high temperature in August: 40.2°C

The warmest month (with the highest average high temperature) is July (41.2°C).
The month with the lowest average high temperature is December (18.9°C).

  • Average low temperature in August: 28.2°C

The month with the highest average low temperature is July (28.6°C).
The coldest month (with the lowest average low temperature) is December (7.1°C).

Average humidity in August - Phoenix, AZ
  • Average humidity in August: 36.2%

The month with the highest relative humidity is December (51.8%).
The month with the lowest relative humidity is June (19.4%).

Average rainfall in August - Phoenix, AZ
  • Average rainfall in August: 25.4mm

The wettest month (with the highest rainfall) is July (26.7mm).
The driest month (with the lowest rainfall) is June (0.5mm).

Average rainfall days in August - Phoenix, AZ
  • Average rainfall days in August: 5 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).

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: 11.6h

The month with most sunshine is June (Average sunshine: 13.6h).
The month with least sunshine is December (Average sunshine: 7.9h).

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