September weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk
September, the first month of the autumn, in Phoenix, is also a sweltering month, with temperature in the range of an average high of 96.3°F (35.7°C) and an average low of 78.8°F (26°C).

Temperature

In Phoenix, the average high-temperature in September marginally drops, from a torrid 102.6°F (39.2°C) in August, to a still very hot 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 is 30%.

Rainfall

In Phoenix, Arizona, during September, the rain falls for 4.7 days and regularly aggregates up to 0.67" (17mm) of precipitation. In Phoenix, during the entire year, the rain falls for 44.6 days and collects up to 5.04" (128mm) of precipitation.

Snowfall

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

Daylight

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

Sunshine

The average sunshine in September is 9.7h.

UV index

In September, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in September in Phoenix?

In September, in Phoenix, Arizona, the average high-temperature is 96.3°F (35.7°C), and the average low-temperature is 78.8°F (26°C).

What is the average humidity in September in Phoenix?

The average relative humidity in September in Phoenix is 30%.

How much does it rain in Phoenix in September?

In Phoenix, Arizona, in September, during 4.7 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.

When does it start to snow in Phoenix?

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

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.

How many hours of daylight does Phoenix have in September?

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

How long on average sun shines in September in Phoenix?

In September, the average sunshine is 9.7h.

How high is the UV index in September in Phoenix?

In Phoenix, Arizona, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to the UV radiation.
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).

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

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

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).

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%).

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").

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).

Average snowfall in September - Phoenix, AZ
  • Average snowfall in September: 0.04"

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

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).

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).

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).

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).

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).

Average visibility in September - Phoenix, AZ
  • Average visibility in September: 6mi

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