September weather forecast
Phoenix, AZ

The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk

Weather in September

The first month of the autumn, September, is also a sweltering month in Phoenix, Arizona, with average temperature ranging between min 78.8°F (26°C) and max 96.3°F (35.7°C).

Temperature

In Phoenix, the average high-temperature in September slightly decreases, from a torrid 102.6°F (39.2°C) in August, to a still very hot 96.3°F (35.7°C). The average low-temperature, in September, is 78.8°F (26°C).

Humidity

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

Rainfall

In Phoenix, it is raining for 4.7 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, there are 44.6 rainfall days, and 5.04" (128mm) of precipitation is accumulated.

Snowfall

The only month with snowfall in Phoenix, Arizona, is September. September is the month with the most snowfall in Phoenix, Arizona. Snow falls for 0.1 days and accumulates 0.04" (1mm) of snow.

Daylight

In September, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine in Phoenix, Arizona, is 9.7h.

UV index

In Phoenix, the average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Phoenix?

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

How many days does it rain in September in Phoenix?

In September, in Phoenix, Arizona, the rain falls for 4.7 days. Throughout September, 0.67" (17mm) of precipitation is accumulated.

What is the snowiest month in Phoenix?

The month with the most snowfall in Phoenix, Arizona, is September when snow falls for 0.1 days and typically aggregates up to 0.04" (1mm) of snow.

When does it start to snow in Phoenix?

September is the first month it typically snows in Phoenix. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

How many hours of daylight does Phoenix have in September?

In September, the average length of the day in Phoenix, Arizona, is 12.4h.

How many hours of sunshine does Phoenix have in September?

In September, the average sunshine is 9.7h.

What is the UV index intensity in September in Phoenix?

In September, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Phoenix, AZ

Average temperature in September - Phoenix, AZ
  • Average high temperature in September: 35.7°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 September: 26°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).

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Average pressure in September
Phoenix, AZ

Average pressure in September - Phoenix, AZ
  • Average pressure in September: 1011.4mbar

The month with the highest atmospheric pressure is January (1018.9mbar).
The month with the lowest atmospheric pressure is June (1009.5mbar).

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Average wind speed in September
Phoenix, AZ

Average wind speed in September - Phoenix, AZ
  • Average wind speed in September: 8.3km/h

The windiest month (with the highest average wind speed) is April (10.3km/h).
The calmest month (with the lowest average wind speed) is December (7km/h).

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Average humidity in September
Phoenix, AZ

Average humidity in September - Phoenix, AZ
  • Average humidity in September: 30%

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

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Average rainfall in September
Phoenix, AZ

Average rainfall in September - Phoenix, AZ
  • Average rainfall in September: 17mm

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

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Average rainfall days in September
Phoenix, AZ

Average rainfall days in September - Phoenix, AZ
  • Average rainfall days in September: 4.7 days

The month with the highest number of rainy days is July (7.8 days).
The month with the least rainy days is June (0.8 days).

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Average snowfall in September
Phoenix, AZ

Average snowfall in September - Phoenix, AZ
  • Average snowfall in September: 1mm

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

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Average snowfall days in September
Phoenix, AZ

Average snowfall days in September - Phoenix, AZ
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is September (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).

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Average daylight in September /
Average sunshine in September
Phoenix, AZ

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 the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 9.7h

The month with the most sunshine is June (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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Average sunshine days in September
Phoenix, AZ

Average sunshine days in September - Phoenix, AZ
  • Average sunshine days in September: 23.7 days

The month with the most sunshine days is May (29.2 days).
The month with the least sunshine days is July (21.1 days).

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Average UV index in September
Phoenix, AZ

Average UV index in September - Phoenix, AZ
  • Average UV index in September: 7

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).

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Average cloud cover in September
Phoenix, AZ

Average cloud cover in September - Phoenix, AZ
  • Average cloud cover in September: 10

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 5).

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Average visibility in September
Phoenix, AZ

Average visibility in September - Phoenix, AZ
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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