September weather forecast and climate
Phoenix, AZ

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). These temperatures are still high and may be accompanied by dust and swirl winds. Expect rain for an average of three days during the month to read 0.9" (22.9mm) likely accompanied by thunderstorms and lightning strikes.

What is the temperature in September in Phoenix?

The average high-temperature, in September, in Phoenix, is 99.9°F (37.7°C), while the average low-temperature is 76.8°F (24.9°C).

How much does it rain in Phoenix in September?

In Phoenix, during September, the rain falls for 2.8 days and regularly aggregates up to 0.6" (16.3mm) of precipitation.
Average temperature in September - Phoenix, AZ
  • Average high temperature in September: 37.7°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 September: 24.9°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 September - Phoenix, AZ
  • 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%).

Average rainfall in September - Phoenix, AZ
  • Average rainfall in September: 16.3mm

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 September - Phoenix, AZ
  • 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).

Average daylight in September / Average sunshine in September - Phoenix, AZ
  • Average daylight in September: 12.4h

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 September: 11h

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 September - Phoenix, AZ
  • 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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