Phoenix
Arizona, USA
Long-term weather forecast
Long-term weather forecast
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August weather forecast and Climate
Phoenix, AZ

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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 in the month to collect 1.3" (33mm). Phoenix is known as the sunshine city - enjoy up to twelve hours of sunshine across the day.
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  • The average high temperature in August: 104.4°F

The warmest month (with the highest average high temperature) is July (106.1°F).
The month with the lowest average high temperature is December (66°F).

  • The average low temperature in August: 82.7°F

The month with the highest average low temperature is July (83.5°F).
The coldest month (with the lowest average low temperature) is December (44.8°F).

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  • The 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%).

  • The average rainfall in August: 1"

The wettest month (with the highest rainfall) is July (1.1").
The driest month (with the lowest rainfall) is June (0").

  • The 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).

  • The average daylight in August: 13h

Months with the longest days are May, June and July (Average daylight: 14h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The 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).

  • The 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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