September weather forecast and climate
Tucson, AZ

Sunset in downtown Tucson, Arizona with a skyline and a sentinel peak in the distance
Sunset in downtown Tucson, Arizona with a skyline and a sentinel peak in the distance

Weather in September

The first month of the autumn, September, is still a hot month in Tucson, Arizona, with average temperature varying between 70.7°F (21.5°C) and 88.7°F (31.5°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still tropical 88.7°F (31.5°C). In Tucson, in September, the average low-temperature is 70.7°F (21.5°C).

Heat index

The average heat index is estimated at a tropical 88.9°F (31.6°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like pregnancy, wind, metabolic differences, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in September is 40%.

Rainfall

In Tucson, Arizona, in September, it is raining for 8.6 days, with typically 0.98" (25mm) of accumulated precipitation. In Tucson, during the entire year, the rain falls for 66.1 days and collects up to 7.95" (202mm) of precipitation.

Snowfall

In Tucson snow does not fall in February through December.

Daylight

In September, the average length of the day in Tucson is 12.3h.

Sunshine

The average sunshine in September is 9.8h.

UV index

The average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Tucson?

In Tucson, Arizona, in September, the average high-temperature is 88.7°F (31.5°C), and the average low-temperature is 70.7°F (21.5°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), that takes the relative humidity and factores it into the air temperature reading, is estimated at 88.9°F (31.6°C).

What is the average humidity in September in Tucson?

The average relative humidity in September in Tucson, Arizona, is 40%.

How many days does it rain in September in Tucson?

In Tucson, Arizona, in September, it is raining for 8.6 days, with typically 0.98" (25mm) of accumulated precipitation.

When it does not snow in Tucson?

In Tucson, Arizona, snow does not fall in February through December.

How many hours of daylight does Tucson have in September?

The average length of the day in September in Tucson is 12.3h.

How long on average sun shines in September in Tucson?

The average sunshine in September in Tucson, Arizona, is 9.8h.

What is the UV index intensity in September in Tucson?

In September, the average daily maximum UV index in Tucson, Arizona, is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Tucson, AZ

Average temperature in September - Tucson, AZ
  • Average high temperature in September: 88.7°F

The warmest month (with the highest average high temperature) is June (96.6°F).
The month with the lowest average high temperature is December (60.8°F).

  • Average low temperature in September: 70.7°F

The month with the highest average low temperature is July (77°F).
The coldest months (with the lowest average low temperature) are January and December (43°F).

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Average pressure in September
Tucson, AZ

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

The month with the highest atmospheric pressure is January (30.08").
The month with the lowest atmospheric pressure is June (29.83").

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Average wind speed in September
Tucson, AZ

Average wind speed in September - Tucson, AZ
  • Average wind speed in September: 6.1mph

The windiest months (with the highest average wind speed) are April and May (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in September
Tucson, AZ

Average humidity in September - Tucson, AZ
  • Average humidity in September: 40%

The month with the highest relative humidity is December (45%).
The month with the lowest relative humidity is June (19%).

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Average rainfall in September
Tucson, AZ

Average rainfall in September - Tucson, AZ
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is July (1.42").
The driest month (with the least rainfall) is May (0.08").

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Average rainfall days in September
Tucson, AZ

Average rainfall days in September - Tucson, AZ
  • Average rainfall days in September: 8.6 days

The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is May (1.3 days).

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Average snowfall in September
Tucson, AZ

Average snowfall in September - Tucson, AZ
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.08").
Months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Tucson, AZ

Average snowfall days in September - Tucson, AZ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.2 days).
Months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

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

Average daylight in September / Average sunshine in September - Tucson, AZ
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.2h).
The month with the shortest days is December (Average daylight: 10.1h).

  • Average sunshine in September: 9.8h

The month with the most sunshine is August (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 7h).

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Average sunshine days in September
Tucson, AZ

Average sunshine days in September - Tucson, AZ
  • Average sunshine days in September: 19.5 days

The month with the most sunshine days is May (29.3 days).
The month with the least sunshine days is July (13.3 days).

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Average UV index in September
Tucson, AZ

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

The month with the highest UV index is June (UV index 8).
Months with the lowest UV index are November and December (UV index 3).

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Average cloud cover in September
Tucson, AZ

Average cloud cover in September - Tucson, AZ
  • Average cloud cover in September: 13

The month with the most cloud cover is December (Cloud cover 19).
Months with the least cloud cover are May and June (Cloud cover 7).

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Average visibility in September
Tucson, AZ

Average visibility in September - Tucson, 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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