September weather forecast
Phoenix, AZ

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

Weather in September

September, the first month of the autumn in Phoenix, is still a torrid month, with an average temperature varying between 78.8°F (26°C) and 96.3°F (35.7°C).

Temperature

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

Humidity

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

Rainfall

In September, the rain falls for 4.7 days. Throughout September, 0.67" (17mm) of precipitation is accumulated. Throughout the year, in Phoenix, there are 44.6 rainfall days, and 5.04" (128mm) of precipitation is accumulated.

Snowfall

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

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of the month, sunrise is at 6:02 am and sunset at 6:53 pm. On the last day of September, in Phoenix, sunrise is at 6:22 am and sunset at 6:14 pm MST.

Sunshine

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

UV index

The average daily maximum UV index in September in Phoenix, Arizona, is 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 7 in September transform into the following instructions:
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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Phoenix?

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

How much does it rain in Phoenix in September?

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 is September, when snow falls for 0.1 days and typically aggregates up to 0.04" (1mm) of snow.

When does it start snowing 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 Phoenix, Arizona, the average day length in September is 12h and 22min.

When is the sunrise / sunset in September in Phoenix?

In September, on the first day of the month, sunrise is at 6:02 am and sunset at 6:53 pm. On the last day of the month, in Phoenix, Arizona, sunrise is at 6:22 am and sunset at 6:14 pm MST.

How many hours of sunshine does Phoenix have in September?

The average sunshine duration in September in Phoenix is 9.7h.

What is the UV index reading in September in Phoenix?

In September, the average daily maximum UV index in Phoenix is 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Phoenix, AZ

Average temperature in September - Phoenix, AZ
  • Average high temperature in September: 96.3°F

The warmest month (with the highest average high temperature) is July (103.6°F).
The month with the lowest average high temperature is December (63°F).

  • Average low temperature in September: 78.8°F

The month with the highest average low temperature is August (84.7°F).
The coldest month (with the lowest average low temperature) is January (47.5°F).

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Average pressure in September
Phoenix, AZ

Average pressure in September - Phoenix, AZ
  • Average pressure in September: 29.87"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.81"Hg).

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Average wind speed in September
Phoenix, AZ

Average wind speed in September - Phoenix, AZ
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is April (6.4mph).
The calmest month (with the lowest average wind speed) is December (4.3mph).

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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: 0.67"

The wettest month (with the highest rainfall) is July (0.75").
The driest months (with the least rainfall) are May and June (0.08").

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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: 0.04"

The month with the highest snowfall is September (0.04").
The months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0").

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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).
The 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: 12h and 22min

The month with the longest days is June (Average daylight: 14h and 20min).
The month with the shortest days is December (Average daylight: 9h and 59min).

  • Average sunshine in September: 9h and 42min

The month with the most sunshine is June (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).

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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

The 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: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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