September weather forecast
Scottsdale, AZ

Share
A scenic waterfront canal running through Scottsdale, Arizona
A scenic waterfront canal running through Scottsdale, Arizona

Weather in September

September brings with it a marked decrease in temperatures, paving the way for more manageable conditions. Despite the heat of the summer abating, rainfall stays consistent with August's totals, extending Scottsdale, Arizona's wettest period of the year. Though the length of sunny hours has reduced, it remains sufficiently warm for recreational activities. A decrease in wind speed further accentuates the humid conditions prevailing. As the month progresses, residents begin experiencing autumnal weather.

Temperature

During the shift to September, Scottsdale records a mild decrease in average high-temperature, moving from 101.8°F (38.8°C) in August to a still very hot 95.9°F (35.5°C). In Scottsdale, an average nighttime temperature of 77.9°F (25.5°C) is expected during September.

Humidity

The average relative humidity in September in Scottsdale, Arizona, is 30%.

Rainfall

In September, in Scottsdale, the rain falls for 7.3 days. Throughout September, 0.94" (24mm) of precipitation is accumulated. In Scottsdale, during the entire year, the rain falls for 57.7 days and collects up to 7.72" (196mm) of precipitation.

Daylight

In Scottsdale, the average length of the day in September is 12h and 22min.
On the first day of September, sunrise is at 6:02 am and sunset at 6:52 pm. On the last day of the month, sunrise is at 6:21 am and sunset at 6:12 pm MST.

Sunshine

The average sunshine in September in Scottsdale is 9.6h.

UV index

In September, the average daily maximum UV index in Scottsdale, Arizona, is 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 7 in September converts into the following recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.

Frequently asked questions

How hot is it in Scottsdale in September?

The high-temperature, in September, in Scottsdale, records 95.9°F (35.5°C), while the low-temperature is 77.9°F (25.5°C).

What is the average humidity in September in Scottsdale?

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

How much does it rain in Scottsdale in September?

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

How many hours of daylight does Scottsdale have in September?

The average day length in September in Scottsdale, Arizona, is 12h and 22min.

What time are sunrise and sunset in September in Scottsdale?

On the first day of September in Scottsdale, sunrise is at 6:02 am and sunset at 6:52 pm. On the last day of the month, sunrise is at 6:21 am and sunset at 6:12 pm MST.

How many hours of sunshine does Scottsdale have in September?

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

What is the UV index reading in September in Scottsdale?

The average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Scottsdale, AZ

Average temperature in September - Scottsdale, 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).

Average pressure in September
Scottsdale, AZ

Average pressure in September - Scottsdale, 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).

Average wind speed in September
Scottsdale, AZ

Average wind speed in September - Scottsdale, 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).

Average humidity in September
Scottsdale, AZ

Average humidity in September - Scottsdale, 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%).

Average rainfall in September
Scottsdale, AZ

Average rainfall in September - Scottsdale, 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").

Average rainfall days in September
Scottsdale, AZ

Average rainfall days in September - Scottsdale, 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).

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

Average daylight in September / Average sunshine in September - Scottsdale, AZ
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 9h and 4min

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

Average sunshine days in September
Scottsdale, AZ

Average sunshine days in September - Scottsdale, 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).

Average UV index in September
Scottsdale, AZ

Average UV index in September - Scottsdale, 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).

Average cloud cover in September
Scottsdale, AZ

Average cloud cover in September - Scottsdale, 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).

Average visibility in September
Scottsdale, AZ

Average visibility in September - Scottsdale, 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).

Scottsdale, Arizona, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location