Sierra Vista
Arizona, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Sierra Vista, AZ

The vast Sierra Vista region of Arizona, and a view of a local church and distant mountain ranges
The vast Sierra Vista region of Arizona, and a view of a local church and distant mountain ranges
The first month of the autumn, September, is still a tropical month in Sierra Vista, Arizona, with average temperature fluctuating between 60.3°F (15.7°C) and 86.7°F (30.4°C).

Temperature

In Sierra Vista, the average high-temperature in September is almost the same as in August - a still hot 86.7°F (30.4°C). In Sierra Vista, the average low-temperature is 60.3°F (15.7°C).

Rainfall

In Sierra Vista, it is raining for 5 days, with typically 1.5" (38mm) of accumulated precipitation. In Sierra Vista, during the entire year, the rain falls for 52 days and collects up to 13.9" (352mm) of precipitation.

Snowfall

In Sierra Vista, during the entire year, snow aggregates up to 0.8" (20.3mm).

Daylight

In Sierra Vista, the average length of the day is 12.3h.

Sunshine

In September, the average sunshine in Sierra Vista is 10h.

UV index

In September, the average daily maximum UV index in Sierra Vista, Arizona, is 9. A UV Index value of 8 to 10 symbolizes a very high threat to health from the exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 9 translate into the following recommendations:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.

What is the temperature in September in Sierra Vista?

In Sierra Vista, Arizona, in September, the average high-temperature is 86.7°F (30.4°C), and the average low-temperature is 60.3°F (15.7°C).

How many days does it rain in September in Sierra Vista?

In Sierra Vista, in September, during 5 rainfall days, 1.5" (38mm) of precipitation is typically accumulated.

How many hours of daylight does Sierra Vista have in September?

In September, the average length of the day in Sierra Vista, Arizona, is 12.3h.

How long on average sun shines in September in Sierra Vista?

In Sierra Vista, the average sunshine in September is 10h.

What is the UV index intensity in September in Sierra Vista?

In Sierra Vista, the average daily maximum UV index in September is 9. A UV Index reading of 8 to 10 represents a very high hazard to health from unprotected exposure to the UV radiation.
Average temperature in September - Sierra Vista, AZ
  • Average high temperature in September: 86.8°F

The warmest month (with the highest average high temperature) is June (92.9°F).
The month with the lowest average high temperature is January (61.2°F).

  • Average low temperature in September: 60.3°F

The month with the highest average low temperature is July (66.3°F).
The coldest month (with the lowest average low temperature) is December (33.9°F).

Average rainfall in September - Sierra Vista, AZ
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is July (3.8").
The driest month (with the lowest rainfall) is May (0.1").

Average rainfall days in September - Sierra Vista, AZ
  • Average rainfall days in September: 5 days

The month with the highest number of rainy days is August (12 days).
The month with the lowest number of rainy days is May (1 days).

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

The month with the highest snowfall is January (0.3").
Months with the lowest snowfall are April, May, June, July, August, September, October and November (0").

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

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

  • Average sunshine in September: 10h

Months with most sunshine are May and June (Average sunshine: 12h).
The month with least sunshine is December (Average sunshine: 7h).

Average UV index in September - Sierra Vista, AZ
  • Average UV index in September: 9

The month with the highest UV index is July (UV index 12).
The month with the lowest UV index is December (UV index 3).