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

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The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk
The sunshine hours drop to eleven getting a little cooler even from the temperatures that fall to a range between 69.8°F (21°C) and 98.6°F (37°C). This temperatures are still high and may be accompanied by dust and swirl winds. Expect rain for an average of three days in the month to read 0.9" (22.9mm) likely accompanied by thunderstorms and lightning strikes.
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  • The average high temperature in September: 99.8°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 September: 76.9°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 September: 35.6%

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 September: 0.6"

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 September: 2.8 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 September: 12h

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 September: 11h

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 September: 8

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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