September weather forecast and climate
Tempe, AZ

The Tempe Town Lake of Tempe City, Arizona
The Tempe Town Lake of Tempe City, Arizona

Weather in September

The first month of the autumn, September, is also a sweltering month in Tempe, Arizona, with average temperature fluctuating between 77.9°F (25.5°C) and 95.9°F (35.5°C).

Temperature

In Tempe, the average high-temperature in September slightly decreases, from a sweltering 101.8°F (38.8°C) in August, to a still torrid 95.9°F (35.5°C). In Tempe, the average low-temperature is 77.9°F (25.5°C).

Humidity

In Tempe, Arizona, the average relative humidity is 30%.

Rainfall

In September, in Tempe, the rain falls for 7.3 days. Throughout September, 0.94" (24mm) of precipitation is accumulated. Throughout the year, there are 57.7 rainfall days, and 7.72" (196mm) of precipitation is accumulated.

Daylight

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

Sunshine

In Tempe, Arizona, the average sunshine is 9.6h.

UV index

The average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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.
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FAQ

What is the temperature in September in Tempe?

In September, in Tempe, Arizona, the average high-temperature is 95.9°F (35.5°C), and the average low-temperature is 77.9°F (25.5°C).

What is the average humidity in September in Tempe?

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

How many days does it rain in September in Tempe?

In Tempe, Arizona, during September, the rain falls for 7.3 days and regularly aggregates up to 0.94" (24mm) of precipitation.

What is the average length of the day in September in Tempe?

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

How long on average sun shines in September in Tempe?

In Tempe, Arizona, the average sunshine in September is 9.6h.

What is the UV index reading in September in Tempe?

The average daily maximum UV index in September in Tempe, Arizona, is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Tempe, AZ

Average temperature in September - Tempe, AZ
  • Average high temperature in September: 95.9°F

The warmest month (with the highest average high temperature) is July (102.6°F).
The month with the lowest average high temperature is December (62.8°F).

  • Average low temperature in September: 77.9°F

The month with the highest average low temperature is August (84.4°F).
The coldest month (with the lowest average low temperature) is January (46.9°F).

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Average pressure in September
Tempe, AZ

Average pressure in September - Tempe, 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").

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Average wind speed in September
Tempe, AZ

Average wind speed in September - Tempe, AZ
  • Average wind speed in September: 5.1mph

The windiest months (with the highest average wind speed) are April and May (6.3mph).
The calmest month (with the lowest average wind speed) is December (4.4mph).

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Average humidity in September
Tempe, AZ

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

The month with the highest relative humidity is December (44%).
The month with the lowest relative humidity is June (16%).

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Average rainfall in September
Tempe, AZ

Average rainfall in September - Tempe, AZ
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is July (1.14").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in September
Tempe, AZ

Average rainfall days in September - Tempe, AZ
  • Average rainfall days in September: 7.3 days

The month with the highest number of rainy days is July (10.2 days).
The month with the least rainy days is June (1 days).

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

Average daylight in September / Average sunshine in September - Tempe, 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: 9.6h

Months with the most sunshine are June and August (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
Tempe, AZ

Average sunshine days in September - Tempe, AZ
  • Average sunshine days in September: 20.9 days

The month with the most sunshine days is May (28.7 days).
The month with the least sunshine days is July (16.8 days).

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Average UV index in September
Tempe, AZ

Average UV index in September - Tempe, 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
Tempe, AZ

Average cloud cover in September - Tempe, AZ
  • Average cloud cover in September: 11

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
Tempe, AZ

Average visibility in September - Tempe, 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).

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