September weather forecastScottsdale, AZ
September
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
September implies a soft temperature shift, with average high-temperatures reducing from August's torrid 101.8°F (38.8°C) to a still sweltering 95.9°F (35.5°C). Nighttime temperatures in September average to a moderately hot 77.9°F (25.5°C).Humidity
The average relative humidity in September is 30%.Rainfall
In September, the rain falls for 7.3 days. Throughout September, 0.94" (24mm) of precipitation is accumulated. In Scottsdale, Arizona, during the entire year, the rain falls for 57.7 days and collects up to 7.72" (196mm) of precipitation.Daylight
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 is 9.6h.UV index
In September, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 7 during September translates into the following recommendations:
Stay clear of intense sun exposure. Solar protection is of utmost significance. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 12h and 24min
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 36min
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: 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: 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: 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: 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).
