Temperatures in September
It's hot in September in Phoenix with an average temperature of 38°C. Temperatures this month range from a low of 36°C to a high of 41°C. At night, you can expect temperatures between 23°C and 30°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Phoenix in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Phoenix with hot temperatures, averaging around 40°C during the day and nights close to 29°C. There’s little chance of precipitation. The weather is mostly sunny and dry. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Mid-September
By mid-September, the average daytime temperature drops to around 39°C, with nights close to 27°C. Not much precipitation expected during this period. It’s mostly dry with sunshine. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
End of September
By the end of September, the average daytime temperature in Phoenix will be around 37°C, with nights close to 25°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
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Precipitation in September
In September, there is an average of 21 mm of precipitation, spread over 3 days. The wind speed is around 4 Bft, mostly coming from the South.
The average chance of precipitation is only 8% in September.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Phoenix. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Phoenix in September |
London | ||
|---|---|---|---|
 Average Temperature |
38°C | 20°C | |
 High Temp |
41°C | 22°C | |
| Low Temp |
36°C | 17°C | |
 Total Precipitation |
21 mm | 44 mm | |
| Rainy Days |
3 days | 8 days | |
August
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit Phoenix?
September isn’t a good time to be in Phoenix. The average temperature of 38°C this month is uncomfortably hot for a pleasant stay.
Temperature records for Phoenix in September
With 45°C, Phoenix hit the highest temperature in the last 10 years in September 2020. The lowest daytime temperature in this month was 27°C in 2021. The extreme night temperatures ranged from a low of 16°C to a high of 33°C.
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Daily Temperature in September in Phoenix
This chart shows the average daily temperatures, both day and night, for each day in September in Phoenix, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Phoenix
The chart below shows the average daily precipitation in September for Phoenix, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 3 days of rain in Phoenix.
Daily UV Index in September in Phoenix
This chart shows the average daily UV index in September in Phoenix, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Phoenix Over the Years
This chart shows the average temperature in September in Phoenix, measured in degrees Celsius, over the past years.
Total Precipitation in September in Phoenix Over the Years
This chart shows the average precipitation in September in Phoenix, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Phoenix
Click on a specific day in September for detailed info on the typical weather on that day in Phoenix. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Phoenix
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Average Weather in Phoenix by Month
Click on a month below to see detailed weather info for Phoenix. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
