September weather forecast and climate
Mesa, AZ

The scenic city of Mesa in Arizona, with a view of the famous well-manicured golf course near the Red Mountain range
The scenic city of Mesa in Arizona, with a view of the famous well-manicured golf course near the Red Mountain range

Weather in September

The first month of the autumn, September, is still a torrid month in Mesa, Arizona, with average temperature fluctuating between 77.4°F (25.2°C) and 95.4°F (35.2°C).

Temperature

In Mesa, Arizona, the average high-temperature slightly decreases, from a very hot 100.9°F (38.3°C) in August, to a still sweltering 95.4°F (35.2°C). The average low-temperature, in September, is 77.4°F (25.2°C).

Humidity

The average relative humidity in Mesa is 31%.

Rainfall

In Mesa, in September, during 7.4 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, in Mesa, there are 60.2 rainfall days, and 7.91" (201mm) of precipitation is accumulated.

Daylight

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

Sunshine

In September, the average sunshine is 9.7h.

UV index

In Mesa, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
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 Mesa?

In September, in Mesa, Arizona, the average high-temperature is 95.4°F (35.2°C), and the average low-temperature is 77.4°F (25.2°C).

What is the average humidity in September in Mesa?

In September, the average relative humidity in Mesa is 31%.

How many days does it rain in September in Mesa?

In Mesa, in September, it is raining for 7.4 days, with typically 0.79" (20mm) of accumulated precipitation.

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

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

How long on average sun shines in September in Mesa?

In September, the average sunshine is 9.7h.

What is the UV index reading in September in Mesa?

The average daily maximum UV index in September in Mesa is 7. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to the UV radiation.

Average temperature in September
Mesa, AZ

Average temperature in September - Mesa, AZ
  • Average high temperature in September: 95.4°F

The warmest month (with the highest average high temperature) is July (101.8°F).
The month with the lowest average high temperature is December (62.4°F).

  • Average low temperature in September: 77.4°F

The month with the highest average low temperature is August (83.8°F).
The coldest month (with the lowest average low temperature) is January (46.4°F).

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Average pressure in September
Mesa, AZ

Average pressure in September - Mesa, AZ
  • Average pressure in September: 29.88"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.82").

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Average wind speed in September
Mesa, AZ

Average wind speed in September - Mesa, AZ
  • Average wind speed in September: 5.2mph

The windiest months (with the highest average wind speed) are April and May (6.4mph).
The calmest month (with the lowest average wind speed) is December (4.5mph).

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Average humidity in September
Mesa, AZ

Average humidity in September - Mesa, AZ
  • Average humidity in September: 31%

The month with the highest relative humidity is December (44%).
The month with the lowest relative humidity is June (17%).

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Average rainfall in September
Mesa, AZ

Average rainfall in September - Mesa, AZ
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is July (1.1").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in September
Mesa, AZ

Average rainfall days in September - Mesa, AZ
  • Average rainfall days in September: 7.4 days

The month with the highest number of rainy days is July (10.6 days).
The month with the least rainy days is June (1.2 days).

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

Average daylight in September / Average sunshine in September - Mesa, 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: 9.7h

The month with the most sunshine is June (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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Average sunshine days in September
Mesa, AZ

Average sunshine days in September - Mesa, AZ
  • Average sunshine days in September: 20 days

The month with the most sunshine days is May (28.4 days).
The month with the least sunshine days is July (17.6 days).

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Average UV index in September
Mesa, AZ

Average UV index in September - Mesa, AZ
  • Average UV index in September: 7

Months with the highest UV index are 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
Mesa, AZ

Average cloud cover in September - Mesa, AZ
  • Average cloud cover in September: 10

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
Mesa, AZ

Average visibility in September - Mesa, 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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