Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Tempe in September experiences a gentle temperature dip, with average high-temperatures reducing from 101.8°F (38.8°C) in August to a still sweltering 95.9°F (35.5°C). Nightly temperatures drop to an average low of 77.9°F (25.5°C) in September.Humidity
In Tempe, the average relative humidity in September is 30%.Rainfall
In Tempe, during September, the rain falls for 7.3 days and regularly aggregates up to 0.94" (24mm) of precipitation. Throughout the year, in Tempe, there are 57.7 rainfall days, and 7.72" (196mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September in Tempe, 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 6:13 pm MST.
Sunshine
In September, the average sunshine in Tempe is 9.6h.UV index
In Tempe, the average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, a regular UV index of 7 translates into these guidelines:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in Tempe in September?
What is the average humidity in September in Tempe?
How much does it rain in Tempe in September?
What is the average length of the day in September in Tempe?
When are sunrise and sunset in September in Tempe?
How long on average sun shines in September in Tempe?
What is the UV index reading in September in Tempe?
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).
Average pressure in September
Tempe, 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
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).
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%).
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").
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).
Average daylight in September /
Average sunshine in September
Tempe, 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
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).
Average UV index in September
Tempe, 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
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).
Average visibility in September
Tempe, 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).
Tempe, Arizona, USA
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