September weather forecast
Sierra Vista, AZ

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The vast Sierra Vista region of Arizona
The vast Sierra Vista region of Arizona

Weather in September

September marks the beginning of a gradual decrease in both temperatures and rainfall. While the temperature drops slightly, the city receives significantly less rainfall compared to the preceding months, with an average precipitation of 2.32" (59mm). Sierra Vista's favorable climatic shift in September makes for a pleasant sightseeing and travel experience. Daylight hours start to wane, signaling the departure of summer and the onset of fall. Conditions remain suitable for outdoor activities during this transitional period.

Temperature

September's arrival shows an average high-temperature of a moderately hot 81.7°F (27.6°C), hardly different from the previous month. September nights cool down to an average low-temperature of 63.1°F (17.3°C).

Heat index

The heat index value during September is estimated at 82.4°F (28°C). Exhaustion becomes probable with enduring exposure and activity, potentially causing heat cramps.
In the scope of the heat index, its values resonate with shade and light wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.

Humidity

September is the most humid month, with an average relative humidity of 50%.

Rainfall

In Sierra Vista, during September, the rain falls for 12.9 days and regularly aggregates up to 2.32" (59mm) of precipitation. In Sierra Vista, during the entire year, the rain falls for 92.2 days and collects up to 15.47" (393mm) of precipitation.

Snowfall

In Sierra Vista, snow does not fall in April through November.

Daylight

In Sierra Vista, the average length of the day in September is 12h and 21min.
On the first day of September, sunrise is at 5:57 am and sunset at 6:44 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 6:06 pm MST.

Sunshine

In Sierra Vista, the average sunshine in September is 9.9h.

UV index

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In September, the maximum UV index of 6 transforms into these recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Updated: Jul 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature during September is 81.7°F (27.6°C) and the low-temperature is 63.1°F (17.3°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is estimated at 82.4°F (28°C).

What is the most humid month?

With an average relative humidity of 50%, September is the most humid month.

What is the average humidity in September?

In Sierra Vista, the average relative humidity in September is 50%.

How much does it rain in Sierra Vista in September?

In September, the rain falls for 12.9 days. Throughout September, 2.32" (59mm) of precipitation is accumulated.

When it does not snow?

April through November are months without snowfall in Sierra Vista.

What is the average length of the day in September?

The average day length in September is 12h and 21min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 5:57 am and sunset at 6:44 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 6:06 pm MST.

How long on average sun shines in September?

In Sierra Vista, the average sunshine duration in September is 9.9h.

How high is the UV index in September?

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Sierra Vista, AZ

Average temperature in September - Sierra Vista, AZ
  • Average high temperature in September: 81.7°F

The warmest month (with the highest average high temperature) is June (90.1°F).
The month with the lowest average high temperature is December (56.5°F).

  • Average low temperature in September: 63.1°F

The month with the highest average low temperature is July (69.6°F).
The coldest months (with the lowest average low temperature) are January and December (37.8°F).

Average pressure in September
Sierra Vista, AZ

Average pressure in September - Sierra Vista, AZ
  • Average pressure in September: 29.89"Hg

The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

Average wind speed in September
Sierra Vista, AZ

Average wind speed in September - Sierra Vista, AZ
  • Average wind speed in September: 6.2mph

The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in September
Sierra Vista, AZ

Average humidity in September - Sierra Vista, AZ
  • Average humidity in September: 50%

The month with the highest relative humidity is September (50%).
The months with the lowest relative humidity are May and June (23%).

Average rainfall in September
Sierra Vista, AZ

Average rainfall in September - Sierra Vista, AZ
  • Average rainfall in September: 2.32"

The wettest month (with the highest rainfall) is July (4.53").
The driest month (with the least rainfall) is May (0.12").

Average rainfall days in September
Sierra Vista, AZ

Average rainfall days in September - Sierra Vista, AZ
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is May (2.3 days).

Average snowfall in September
Sierra Vista, AZ

Average snowfall in September - Sierra Vista, AZ
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.46").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Sierra Vista, AZ

Average snowfall days in September - Sierra Vista, AZ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Sierra Vista, AZ

Average daylight in September / Average sunshine in September - Sierra Vista, AZ
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

  • Average sunshine in September: 9h and 5min

The months with the most sunshine are June and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).

Average sunshine days in September
Sierra Vista, AZ

Average sunshine days in September - Sierra Vista, AZ
  • Average sunshine days in September: 14.4 days

The month with the most sunshine days is May (28.1 days).
The month with the least sunshine days is July (6.5 days).

Average UV index in September
Sierra Vista, AZ

Average UV index in September - Sierra Vista, AZ
  • Average UV index in September: 6

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).

Average cloud cover in September
Sierra Vista, AZ

Average cloud cover in September - Sierra Vista, AZ
  • Average cloud cover in September: 17

The month with the most cloud cover is July (Cloud cover 24).
The month with the least cloud cover is May (Cloud cover 8).

Average visibility in September
Sierra Vista, AZ

Average visibility in September - Sierra Vista, 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).

Sierra Vista, Arizona, USA

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